Performance Shift(s): b9a950a9

[github-actions]

Benchmark comparison has identified performance shifts at:

• commit b9a950a (Enable factory references to create new dimensions on load. #6168).

Please review the report below and take corrective/congratulatory action as appropriate :slightly_smiling_face:

⏱️ Performance Benchmark Report: b9a950a

Performance shifts

| Change   | Before [8c213f0c] <main~3>   | After [b9a950a9] <main~2>   |   Ratio | Benchmark (Parameter)                                |
|----------|------------------------------|-----------------------------|---------|------------------------------------------------------|
| +        | 226±2μs                      | 284±2μs                     |    1.26 | import_iris.Iris.time_iris                           |
| +        | 3.58±0.1ms                   | 4.69±0.5ms                  |    1.31 | load.ugrid.DataRealisation.time_realise_data(200000) |

Full benchmark results

Benchmarks that have stayed the same:

| Change   | Before [8c213f0c] <main~3>   | After [b9a950a9] <main~2>   |   Ratio | Benchmark (Parameter)                                                                       |
|----------|------------------------------|-----------------------------|---------|---------------------------------------------------------------------------------------------|
|          | 59.3±0.6ms                   | 59.5±1ms                    |    1    | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(False)                              |
|          | 60.3±0.8ms                   | 60.6±0.6ms                  |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(True)                               |
|          | 212±1ms                      | 213±2ms                     |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(False)                    |
|          | 212±2ms                      | 213±2ms                     |    1    | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(True)                     |
|          | 38.5±0.4ms                   | 38.6±0.2ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(False)                              |
|          | 39.8±0.4ms                   | 39.2±0.4ms                  |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(True)                               |
|          | 38.9±0.5ms                   | 39.0±0.4ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(False)                              |
|          | 39.8±0.3ms                   | 39.3±0.3ms                  |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(True)                               |
|          | 51.3±0.6ms                   | 51.0±0.5ms                  |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX(False)                                |
|          | 51.6±1ms                     | 51.5±0.8ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MAX(True)                                 |
|          | 134±0.7ms                    | 134±1ms                     |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(False)                            |
|          | 136±1ms                      | 135±1ms                     |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(True)                             |
|          | 55.8±0.9ms                   | 56.4±1ms                    |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(False)                               |
|          | 57.2±0.4ms                   | 56.9±0.5ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(True)                                |
|          | 38.4±0.2ms                   | 38.7±0.3ms                  |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(False)                             |
|          | 39.2±0.2ms                   | 39.5±0.2ms                  |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(True)                              |
|          | 51.2±0.7ms                   | 51.0±0.8ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MIN(False)                                |
|          | 51.7±1ms                     | 51.9±0.9ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MIN(True)                                 |
|          | 1.09±0.01s                   | 1.08±0.01s                  |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(False)                               |
|          | 1.09±0.01s                   | 1.08±0.01s                  |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(True)                                |
|          | 511±20ms                     | 508±10ms                    |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(False)                         |
|          | 484±20ms                     | 507±20ms                    |    1.05 | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(True)                          |
|          | 36.7±0.3ms                   | 37.2±0.4ms                  |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(False)                         |
|          | 37.8±0.3ms                   | 37.9±0.3ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(True)                          |
|          | 68.1±0.5ms                   | 68.0±0.9ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(False)                                |
|          | 69.1±1ms                     | 68.9±0.7ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(True)                                 |
|          | 69.6±0.7ms                   | 70.0±0.5ms                  |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(False)                            |
|          | 70.5±0.8ms                   | 70.7±0.4ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(True)                             |
|          | 65.8±0.6ms                   | 65.6±0.4ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(False)                           |
|          | 66.1±0.8ms                   | 66.2±0.7ms                  |    1    | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(True)                            |
|          | 25.5±0.2ms                   | 25.7±0.2ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(False)                               |
|          | 29.6±0.3ms                   | 30.0±0.2ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(True)                                |
|          | 147±0.8ms                    | 147±2ms                     |    1    | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(False)                     |
|          | 161±1ms                      | 162±1ms                     |    1    | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(True)                      |
|          | 23.7±0.3ms                   | 23.8±0.2ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(False)                               |
|          | 27.9±0.1ms                   | 28.1±0.4ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(True)                                |
|          | 23.8±0.2ms                   | 23.7±0.1ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(False)                               |
|          | 27.9±0.2ms                   | 27.9±0.3ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(True)                                |
|          | 24.4±0.3ms                   | 24.6±0.09ms                 |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MAX(False)                                 |
|          | 28.7±0.2ms                   | 28.5±0.2ms                  |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_MAX(True)                                  |
|          | 37.6±0.6ms                   | 37.5±0.7ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(False)                             |
|          | 41.9±0.7ms                   | 41.8±0.8ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(True)                              |
|          | 25.1±0.3ms                   | 25.1±0.3ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(False)                                |
|          | 28.9±0.1ms                   | 29.2±0.2ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(True)                                 |
|          | 24.9±0.3ms                   | 24.9±0.4ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(False)                              |
|          | 29.1±0.3ms                   | 29.1±0.2ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(True)                               |
|          | 24.5±0.2ms                   | 24.4±0.1ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MIN(False)                                 |
|          | 28.5±0.3ms                   | 28.2±0.2ms                  |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_MIN(True)                                  |
|          | 542±6ms                      | 541±6ms                     |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(False)                                |
|          | 544±4ms                      | 548±6ms                     |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(True)                                 |
|          | 161±2ms                      | 162±0.9ms                   |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(False)                          |
|          | 180±1ms                      | 181±2ms                     |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(True)                           |
|          | 23.3±0.1ms                   | 23.4±0.3ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(False)                          |
|          | 27.7±0.3ms                   | 27.7±0.1ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(True)                           |
|          | 26.8±0.4ms                   | 26.9±0.2ms                  |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_RMS(False)                                 |
|          | 31.3±0.4ms                   | 30.9±0.3ms                  |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_RMS(True)                                  |
|          | 26.2±0.2ms                   | 26.7±0.3ms                  |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(False)                             |
|          | 30.6±0.4ms                   | 30.6±0.3ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(True)                              |
|          | 25.8±0.2ms                   | 25.6±0.4ms                  |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(False)                            |
|          | 29.8±0.3ms                   | 29.8±0.2ms                  |    1    | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(True)                             |
|          | 92.2±0.9ms                   | 92.3±0.9ms                  |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(False)                     |
|          | 93.4±1ms                     | 93.5±0.7ms                  |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(True)                      |
|          | 106±0.7ms                    | 105±1ms                     |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(False)                      |
|          | 106±0.9ms                    | 107±0.8ms                   |    1.01 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(True)                       |
|          | 62.8±1ms                     | 63.0±0.7ms                  |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(False)                      |
|          | 63.9±0.7ms                   | 64.1±0.6ms                  |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(True)                       |
|          | 30.9±0.6ms                   | 31.1±0.6ms                  |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(False)                      |
|          | 34.9±0.5ms                   | 34.6±0.5ms                  |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(True)                       |
|          | 32.7±0.5ms                   | 32.5±1ms                    |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(False)                       |
|          | 36.6±0.5ms                   | 36.8±0.6ms                  |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(True)                        |
|          | 26.8±0.2ms                   | 26.5±0.3ms                  |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(False)                       |
|          | 30.7±0.3ms                   | 30.7±0.4ms                  |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(True)                        |
|          | 329±4ms                      | 331±5ms                     |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(False)               |
|          | 350±4ms                      | 349±4ms                     |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(True)                |
|          | 1.12±0.02ms                  | 1.09±0.02ms                 |    0.98 | cube.CubeCreation.time_create(False, 'construct')                                           |
|          | 403±8μs                      | 392±3μs                     |    0.97 | cube.CubeCreation.time_create(False, 'instantiate')                                         |
|          | 957±10μs                     | 933±20μs                    |    0.98 | cube.CubeCreation.time_create(True, 'construct')                                            |
|          | 583±9μs                      | 566±6μs                     |    0.97 | cube.CubeCreation.time_create(True, 'instantiate')                                          |
|          | 235±3ms                      | 235±2ms                     |    1    | cube.CubeEquality.time_equality(False, False, 'all_equal')                                  |
|          | 127±2ms                      | 126±1ms                     |    1    | cube.CubeEquality.time_equality(False, False, 'coord_inequality')                           |
|          | 258±3ms                      | 260±2ms                     |    1.01 | cube.CubeEquality.time_equality(False, False, 'data_inequality')                            |
|          | 16.6±0.3μs                   | 16.5±0.2μs                  |    1    | cube.CubeEquality.time_equality(False, False, 'metadata_inequality')                        |
|          | 335±2ms                      | 336±2ms                     |    1    | cube.CubeEquality.time_equality(False, True, 'all_equal')                                   |
|          | 225±3ms                      | 225±2ms                     |    1    | cube.CubeEquality.time_equality(False, True, 'coord_inequality')                            |
|          | 361±2ms                      | 360±2ms                     |    1    | cube.CubeEquality.time_equality(False, True, 'data_inequality')                             |
|          | 17.2±0.3μs                   | 16.8±0.2μs                  |    0.98 | cube.CubeEquality.time_equality(False, True, 'metadata_inequality')                         |
|          | 234±2ms                      | 236±2ms                     |    1.01 | cube.CubeEquality.time_equality(True, False, 'all_equal')                                   |
|          | 127±1ms                      | 126±1ms                     |    0.99 | cube.CubeEquality.time_equality(True, False, 'coord_inequality')                            |
|          | 260±2ms                      | 260±2ms                     |    1    | cube.CubeEquality.time_equality(True, False, 'data_inequality')                             |
|          | 53.1±0.6μs                   | 52.2±0.4μs                  |    0.98 | cube.CubeEquality.time_equality(True, False, 'metadata_inequality')                         |
|          | 336±2ms                      | 335±2ms                     |    1    | cube.CubeEquality.time_equality(True, True, 'all_equal')                                    |
|          | 226±2ms                      | 225±2ms                     |    0.99 | cube.CubeEquality.time_equality(True, True, 'coord_inequality')                             |
|          | 362±3ms                      | 360±2ms                     |    0.99 | cube.CubeEquality.time_equality(True, True, 'data_inequality')                              |
|          | 54.6±0.6μs                   | 54.2±0.6μs                  |    0.99 | cube.CubeEquality.time_equality(True, True, 'metadata_inequality')                          |
|          | 791±9μs                      | 783±10μs                    |    0.99 | import_iris.Iris.time__concatenate                                                          |
|          | 179±2μs                      | 180±2μs                     |    1    | import_iris.Iris.time__constraints                                                          |
|          | 109±0.6μs                    | 109±0.7μs                   |    1    | import_iris.Iris.time__data_manager                                                         |
|          | 94.5±0.5μs                   | 93.0±0.3μs                  |    0.98 | import_iris.Iris.time__deprecation                                                          |
|          | 138±0.8μs                    | 135±0.7μs                   |    0.98 | import_iris.Iris.time__lazy_data                                                            |
|          | 903±7μs                      | 903±4μs                     |    1    | import_iris.Iris.time__merge                                                                |
|          | 76.8±0.4μs                   | 75.8±0.7μs                  |    0.99 | import_iris.Iris.time__representation                                                       |
|          | 597±10μs                     | 585±6μs                     |    0.98 | import_iris.Iris.time_analysis                                                              |
|          | 139±1μs                      | 138±2μs                     |    0.99 | import_iris.Iris.time_analysis__area_weighted                                               |
|          | 110±2μs                      | 109±1μs                     |    0.99 | import_iris.Iris.time_analysis__grid_angles                                                 |
|          | 245±3μs                      | 239±3μs                     |    0.98 | import_iris.Iris.time_analysis__interpolation                                               |
|          | 188±2μs                      | 186±3μs                     |    0.99 | import_iris.Iris.time_analysis__regrid                                                      |
|          | 110±0.7μs                    | 110±1μs                     |    1    | import_iris.Iris.time_analysis__scipy_interpolate                                           |
|          | 137±1μs                      | 141±2μs                     |    1.03 | import_iris.Iris.time_analysis_calculus                                                     |
|          | 333±4μs                      | 333±7μs                     |    1    | import_iris.Iris.time_analysis_cartography                                                  |
|          | 93.7±0.4μs                   | 92.9±0.7μs                  |    0.99 | import_iris.Iris.time_analysis_geomerty                                                     |
|          | 219±3μs                      | 217±2μs                     |    0.99 | import_iris.Iris.time_analysis_maths                                                        |
|          | 96.7±0.9μs                   | 95.8±0.6μs                  |    0.99 | import_iris.Iris.time_analysis_stats                                                        |
|          | 172±2μs                      | 171±0.8μs                   |    0.99 | import_iris.Iris.time_analysis_trajectory                                                   |
|          | 303±8μs                      | 299±3μs                     |    0.99 | import_iris.Iris.time_aux_factory                                                           |
|          | 83.9±0.7μs                   | 84.6±0.7μs                  |    1.01 | import_iris.Iris.time_common                                                                |
|          | 162±2μs                      | 161±1μs                     |    0.99 | import_iris.Iris.time_common_lenient                                                        |
|          | 1.31±0.01ms                  | 1.32±0.01ms                 |    1    | import_iris.Iris.time_common_metadata                                                       |
|          | 138±1μs                      | 136±1μs                     |    0.99 | import_iris.Iris.time_common_mixin                                                          |
|          | 1.18±0ms                     | 1.17±0.01ms                 |    0.99 | import_iris.Iris.time_common_resolve                                                        |
|          | 196±1μs                      | 196±2μs                     |    1    | import_iris.Iris.time_config                                                                |
|          | 124±2μs                      | 124±1μs                     |    0.99 | import_iris.Iris.time_coord_categorisation                                                  |
|          | 356±3μs                      | 354±3μs                     |    1    | import_iris.Iris.time_coord_systems                                                         |
|          | 739±4μs                      | 740±10μs                    |    1    | import_iris.Iris.time_coords                                                                |
|          | 646±9μs                      | 639±6μs                     |    0.99 | import_iris.Iris.time_cube                                                                  |
|          | 226±4μs                      | 222±2μs                     |    0.98 | import_iris.Iris.time_exceptions                                                            |
|          | 77.2±0.3μs                   | 76.0±0.5μs                  |    0.98 | import_iris.Iris.time_experimental                                                          |
|          | 184±1μs                      | 184±2μs                     |    1    | import_iris.Iris.time_fileformats                                                           |
|          | 253±3μs                      | 248±3μs                     |    0.98 | import_iris.Iris.time_fileformats__ff                                                       |
|          | 2.74±0.01ms                  | 2.74±0.01ms                 |    1    | import_iris.Iris.time_fileformats__ff_cross_references                                      |
|          | 78.5±0.2μs                   | 79.2±0.5μs                  |    1.01 | import_iris.Iris.time_fileformats__pp_lbproc_pairs                                          |
|          | 114±1μs                      | 115±2μs                     |    1.01 | import_iris.Iris.time_fileformats_abf                                                       |
|          | 399±6μs                      | 398±3μs                     |    1    | import_iris.Iris.time_fileformats_cf                                                        |
|          | 5.24±0.05ms                  | 5.29±0.07ms                 |    1.01 | import_iris.Iris.time_fileformats_dot                                                       |
|          | 74.8±0.5μs                   | 75.2±0.7μs                  |    1.01 | import_iris.Iris.time_fileformats_name                                                      |
|          | 258±1μs                      | 258±3μs                     |    1    | import_iris.Iris.time_fileformats_name_loaders                                              |
|          | 119±0.9μs                    | 119±1μs                     |    1    | import_iris.Iris.time_fileformats_netcdf                                                    |
|          | 122±0.9μs                    | 123±3μs                     |    1.01 | import_iris.Iris.time_fileformats_nimrod                                                    |
|          | 210±3μs                      | 209±3μs                     |    0.99 | import_iris.Iris.time_fileformats_nimrod_load_rules                                         |
|          | 775±10μs                     | 770±4μs                     |    0.99 | import_iris.Iris.time_fileformats_pp                                                        |
|          | 181±3μs                      | 179±1μs                     |    0.99 | import_iris.Iris.time_fileformats_pp_load_rules                                             |
|          | 132±1μs                      | 132±2μs                     |    1    | import_iris.Iris.time_fileformats_pp_save_rules                                             |
|          | 515±5μs                      | 544±4μs                     |    1.06 | import_iris.Iris.time_fileformats_rules                                                     |
|          | 221±3μs                      | 218±3μs                     |    0.99 | import_iris.Iris.time_fileformats_structured_array_identification                           |
|          | 82.9±0.3μs                   | 83.4±0.6μs                  |    1.01 | import_iris.Iris.time_fileformats_um                                                        |
|          | 161±2μs                      | 161±0.9μs                   |    0.99 | import_iris.Iris.time_fileformats_um__fast_load                                             |
|          | 136±0.8μs                    | 136±2μs                     |    1    | import_iris.Iris.time_fileformats_um__fast_load_structured_fields                           |
|          | 75.7±0.3μs                   | 75.7±0.6μs                  |    1    | import_iris.Iris.time_fileformats_um__ff_replacement                                        |
|          | 81.7±0.2μs                   | 81.4±0.8μs                  |    1    | import_iris.Iris.time_fileformats_um__optimal_array_structuring                             |
|          | 994±2μs                      | 998±4μs                     |    1    | import_iris.Iris.time_fileformats_um_cf_map                                                 |
|          | 135±0.5μs                    | 135±0.8μs                   |    1    | import_iris.Iris.time_io                                                                    |
|          | 172±2μs                      | 171±0.9μs                   |    1    | import_iris.Iris.time_io_format_picker                                                      |
|          | 126±0.8μs                    | 126±0.5μs                   |    1    | import_iris.Iris.time_iterate                                                               |
|          | 8.20±0.05ms                  | 8.16±0.05ms                 |    0.99 | import_iris.Iris.time_palette                                                               |
|          | 1.90±0.01ms                  | 1.89±0.01ms                 |    1    | import_iris.Iris.time_plot                                                                  |
|          | 104±0.6μs                    | 104±0.4μs                   |    1    | import_iris.Iris.time_quickplot                                                             |
|          | 2.22±0.01ms                  | 2.21±0.01ms                 |    0.99 | import_iris.Iris.time_std_names                                                             |
|          | 1.74±0.01ms                  | 1.75±0.01ms                 |    1.01 | import_iris.Iris.time_symbols                                                               |
|          | 34.6±0.7ms                   | 34.4±0.9ms                  |    1    | import_iris.Iris.time_tests                                                                 |
|          | 258±4μs                      | 255±2μs                     |    0.99 | import_iris.Iris.time_third_party_cartopy                                                   |
|          | 4.69±0.03ms                  | 4.70±0.03ms                 |    1    | import_iris.Iris.time_third_party_cf_units                                                  |
|          | 120±2μs                      | 118±0.8μs                   |    0.98 | import_iris.Iris.time_third_party_cftime                                                    |
|          | 2.82±0ms                     | 2.83±0.02ms                 |    1    | import_iris.Iris.time_third_party_matplotlib                                                |
|          | 1.53±0.01ms                  | 1.54±0.01ms                 |    1.01 | import_iris.Iris.time_third_party_numpy                                                     |
|          | 169±2μs                      | 169±0.9μs                   |    1    | import_iris.Iris.time_third_party_scipy                                                     |
|          | 100±0.6μs                    | 99.9±0.8μs                  |    1    | import_iris.Iris.time_time                                                                  |
|          | 328±5μs                      | 326±3μs                     |    0.99 | import_iris.Iris.time_util                                                                  |
|          | 71.2±0.7μs                   | 70.9±1μs                    |    1    | iterate.IZip.time_izip                                                                      |
|          | 8.94±0.06ms                  | 9.70±0.08ms                 |    1.09 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'FF')                                  |
|          | 25.7±0.2ms                   | 26.2±0.2ms                  |    1.02 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'NetCDF')                              |
|          | 9.00±0.04ms                  | 9.76±0.08ms                 |    1.09 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'PP')                                  |
|          | 8.91±0.05ms                  | 9.63±0.2ms                  |    1.08 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'FF')                                   |
|          | 21.1±0.05ms                  | 22.3±0.2ms                  |    1.06 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'NetCDF')                               |
|          | 8.99±0.07ms                  | 9.69±0.08ms                 |    1.08 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'PP')                                   |
|          | 1.50±0.01s                   | 1.50±0.01s                  |    1    | load.LoadAndRealise.time_load((2, 2, 1000), False, 'FF')                                    |
|          | 21.1±0.07ms                  | 22.1±0.2ms                  |    1.05 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'NetCDF')                                |
|          | 1.52±0.02s                   | 1.52±0.01s                  |    1    | load.LoadAndRealise.time_load((2, 2, 1000), False, 'PP')                                    |
|          | 1.51±0.01s                   | 1.48±0.01s                  |    0.98 | load.LoadAndRealise.time_load((2, 2, 1000), True, 'FF')                                     |
|          | 21.2±0.08ms                  | 22.2±0.2ms                  |    1.05 | load.LoadAndRealise.time_load((2, 2, 1000), True, 'NetCDF')                                 |
|          | 1.52±0.01s                   | 1.53±0.02s                  |    1    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'PP')                                     |
|          | 4.23±0.04ms                  | 5.01±0.03ms                 |    1.18 | load.LoadAndRealise.time_load((50, 50, 2), False, 'FF')                                     |
|          | 20.0±0.3ms                   | 20.6±0.09ms                 |    1.03 | load.LoadAndRealise.time_load((50, 50, 2), False, 'NetCDF')                                 |
|          | 4.21±0.04ms                  | 5.01±0.06ms                 |    1.19 | load.LoadAndRealise.time_load((50, 50, 2), False, 'PP')                                     |
|          | 4.21±0.03ms                  | 4.99±0.03ms                 |    1.18 | load.LoadAndRealise.time_load((50, 50, 2), True, 'FF')                                      |
|          | 19.6±0.06ms                  | 21.1±0.2ms                  |    1.07 | load.LoadAndRealise.time_load((50, 50, 2), True, 'NetCDF')                                  |
|          | 4.20±0.03ms                  | 5.03±0.02ms                 |    1.2  | load.LoadAndRealise.time_load((50, 50, 2), True, 'PP')                                      |
|          | 28.6±3ms                     | 25.0±3ms                    |    0.87 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'FF')                               |
|          | 20.4±0.3ms                   | 19.4±0.3ms                  |    0.95 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'NetCDF')                           |
|          | 13.9±2ms                     | 13.6±1ms                    |    0.98 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'PP')                               |
|          | 26.0±0.7ms                   | 26.2±2ms                    |    1.01 | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'FF')                                |
|          | 79.3±0.6ms                   | 79.6±0.6ms                  |    1    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'NetCDF')                            |
|          | 25.7±2ms                     | 25.5±0.9ms                  |    0.99 | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'PP')                                |
|          | 471±3ms                      | 471±3ms                     |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'FF')                                 |
|          | 2.71±0.04ms                  | 2.82±0.07ms                 |    1.04 | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'NetCDF')                             |
|          | 472±3ms                      | 473±2ms                     |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'PP')                                 |
|          | 485±3ms                      | 482±1ms                     |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'FF')                                  |
|          | 2.83±0.1ms                   | 2.81±0.07ms                 |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'NetCDF')                              |
|          | 480±2ms                      | 481±2ms                     |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'PP')                                  |
|          | 1.66±0.06ms                  | 1.66±0.08ms                 |    1    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'FF')                                  |
|          | 2.75±0.04ms                  | 2.76±0.09ms                 |    1    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'NetCDF')                              |
|          | 1.69±0.07ms                  | 1.66±0.09ms                 |    0.98 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'PP')                                  |
|          | 1.66±0.04ms                  | 1.69±0.07ms                 |    1.02 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'FF')                                   |
|          | 2.90±0.08ms                  | 2.84±0.07ms                 |    0.98 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'NetCDF')                               |
|          | 1.68±0.1ms                   | 1.65±0.06ms                 |    0.98 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'PP')                                   |
|          | 359±3ms                      | 360±3ms                     |    1    | load.ManyVars.time_many_var_load                                                            |
|          | 8.94±0.07ms                  | 9.80±0.07ms                 |    1.1  | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'FF')                            |
|          | 9.16±0.07ms                  | 10.0±0.1ms                  |    1.09 | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'PP')                            |
|          | 1.50±0.02s                   | 1.50±0.01s                  |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'FF')                              |
|          | 1.55±0.01s                   | 1.54±0.02s                  |    0.99 | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'PP')                              |
|          | 4.32±0.03ms                  | 5.04±0.04ms                 |    1.17 | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'FF')                                 |
|          | 4.30±0.02ms                  | 5.01±0.02ms                 |    1.17 | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'PP')                                 |
|          | 8.91±0.1ms                   | 8.94±0.03ms                 |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), False)                               |
|          | 5.76±0.02ms                  | 5.78±0.03ms                 |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), True)                                |
|          | 1.49±0.02s                   | 1.50±0.01s                  |    1.01 | load.StructuredFF.time_structured_load((2, 2, 1000), False)                                 |
|          | 531±10ms                     | 519±3ms                     |    0.98 | load.StructuredFF.time_structured_load((2, 2, 1000), True)                                  |
|          | 4.24±0.03ms                  | 4.21±0.01ms                 |    0.99 | load.StructuredFF.time_structured_load((2, 2, 2), False)                                    |
|          | 4.09±0.03ms                  | 4.05±0.02ms                 |    0.99 | load.StructuredFF.time_structured_load((2, 2, 2), True)                                     |
|          | 160±2ms                      | 162±2ms                     |    1.01 | load.TimeConstraint.time_time_constraint(20, 'FF')                                          |
|          | 23.2±0.09ms                  | 24.1±0.1ms                  |    1.04 | load.TimeConstraint.time_time_constraint(20, 'NetCDF')                                      |
|          | 162±0.7ms                    | 164±1ms                     |    1.01 | load.TimeConstraint.time_time_constraint(20, 'PP')                                          |
|          | 31.6±0.2ms                   | 32.1±0.2ms                  |    1.02 | load.TimeConstraint.time_time_constraint(3, 'FF')                                           |
|          | 22.7±0.1ms                   | 23.6±0.2ms                  |    1.04 | load.TimeConstraint.time_time_constraint(3, 'NetCDF')                                       |
|          | 32.2±0.6ms                   | 32.4±0.2ms                  |    1.01 | load.TimeConstraint.time_time_constraint(3, 'PP')                                           |
|          | 18.0±0.2ms                   | 19.0±0.4ms                  |    1.06 | load.ugrid.BasicLoading.time_load_file(1)                                                   |
|          | 45.2±0.5ms                   | 53.9±0.8ms                  |    1.19 | load.ugrid.BasicLoading.time_load_file(200000)                                              |
|          | 14.4±0.2ms                   | 14.5±0.3ms                  |    1.01 | load.ugrid.BasicLoading.time_load_mesh(1)                                                   |
|          | 24.0±0.2ms                   | 24.4±0.2ms                  |    1.01 | load.ugrid.BasicLoading.time_load_mesh(200000)                                              |
|          | 17.8±0.4ms                   | 19.0±0.3ms                  |    1.07 | load.ugrid.BasicLoadingTime.time_load_file(1)                                               |
|          | 21.9±0.2ms                   | 23.3±0.2ms                  |    1.06 | load.ugrid.BasicLoadingTime.time_load_file(200000)                                          |
|          | 14.4±0.2ms                   | 14.4±0.2ms                  |    1    | load.ugrid.BasicLoadingTime.time_load_mesh(1)                                               |
|          | 18.5±0.3ms                   | 19.0±0.2ms                  |    1.03 | load.ugrid.BasicLoadingTime.time_load_mesh(200000)                                          |
|          | 18.9±0.3ms                   | 19.9±0.3ms                  |    1.05 | load.ugrid.Callback.time_load_file_callback(1)                                              |
|          | 55.0±0.8ms                   | 63.5±0.9ms                  |    1.15 | load.ugrid.Callback.time_load_file_callback(200000)                                         |
|          | 18.6±0.2ms                   | 19.8±0.1ms                  |    1.07 | load.ugrid.CallbackTime.time_load_file_callback(1)                                          |
|          | 23.8±0.1ms                   | 24.7±0.2ms                  |    1.04 | load.ugrid.CallbackTime.time_load_file_callback(200000)                                     |
|          | 2.76±0.07ms                  | 2.70±0.07ms                 |    0.98 | load.ugrid.DataRealisation.time_realise_data(10000)                                         |
|          | 34.2±0.4ms                   | 34.3±0.6ms                  |    1    | load.ugrid.DataRealisationTime.time_realise_data(10000)                                     |
|          | 787±6ms                      | 789±7ms                     |    1    | load.ugrid.DataRealisationTime.time_realise_data(200000)                                    |
|          | 421±3ms                      | 424±3ms                     |    1.01 | merge_concat.Concatenate.time_concatenate(False)                                            |
|          | 426±5ms                      | 421±4ms                     |    0.99 | merge_concat.Concatenate.time_concatenate(True)                                             |
|          | 109±0.4M                     | 109±0.2M                    |    1    | merge_concat.Concatenate.tracemalloc_concatenate(False)                                     |
|          | 109±0.4M                     | 109±0.2M                    |    1    | merge_concat.Concatenate.tracemalloc_concatenate(True)                                      |
|          | 56.5±0.5ms                   | 56.4±0.2ms                  |    1    | merge_concat.Merge.time_merge                                                               |
|          | 758±300k                     | 758±300k                    |    1    | merge_concat.Merge.tracemalloc_merge                                                        |
|          | 459±3ns                      | 457±4ns                     |    0.99 | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(50)              |
|          | 214±2ms                      | 215±1ms                     |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(500)             |
|          | 658±3k                       | 658±2k                      |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(50)       |
|          | 60.1±0M                      | 60.1±0M                     |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(500)      |
|          | 16.2±0.08ms                  | 16.2±0.2ms                  |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(50)           |
|          | 18.2±0.2ms                   | 18.3±0.6ms                  |    1.01 | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(500)          |
|          | 502±10k                      | 493±10k                     |    0.98 | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(50)    |
|          | 12.4±0.01M                   | 12.4±0.01M                  |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(500)   |
|          | 116±0.7ms                    | 116±1ms                     |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(50)         |
|          | 676±7ms                      | 683±7ms                     |    1.01 | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(500)        |
|          | 1.21±0.03M                   | 1.24±0.03M                  |    1.02 | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(50)  |
|          | 96.3±0.03M                   | 96.2±0.02M                  |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(500) |
|          | 76.4±0.8ms                   | 77.5±0.8ms                  |    1.01 | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(50)                             |
|          | 633±3ms                      | 630±4ms                     |    0.99 | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(500)                            |
|          | 1.17±0.02M                   | 1.17±0.02M                  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(50)                      |
|          | 96.2±0.01M                   | 96.2±0.02M                  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(500)                     |
|          | 2.1752849999999997           | 2.1752849999999997          |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(50)                  |
|          | 216.01528499999998           | 216.01528499999998          |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(500)                 |
|          | 6.49±0.08ms                  | 6.41±0.03ms                 |    0.99 | plot.AuxSort.time_aux_sort                                                                  |
|          | 79.5±3ms                     | 77.6±4ms                    |    0.98 | regridding.CurvilinearRegridding.time_regrid_pic                                            |
|          | 136±3M                       | 136±3M                      |    1    | regridding.CurvilinearRegridding.tracemalloc_regrid_pic                                     |
|          | 99.0±0.8ms                   | 99.1±0.8ms                  |    1    | regridding.HorizontalChunkedRegridding.time_regrid_area_w                                   |
|          | 48.4±0.4ms                   | 47.6±1ms                    |    0.98 | regridding.HorizontalChunkedRegridding.time_regrid_area_w_new_grid                          |
|          | 106±0.05M                    | 106±0.04M                   |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w                            |
|          | 147±0.02M                    | 147±0.03M                   |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w_new_grid                   |
|          | 4.40±0.02ms                  | 4.41±0.02ms                 |    1    | save.NetcdfSave.time_netcdf_save_cube(50, False)                                            |
|          | 79.4±0.4ms                   | 79.5±0.5ms                  |    1    | save.NetcdfSave.time_netcdf_save_cube(50, True)                                             |
|          | 53.7±2ms                     | 52.3±1ms                    |    0.97 | save.NetcdfSave.time_netcdf_save_cube(600, False)                                           |
|          | 580±5ms                      | 581±4ms                     |    1    | save.NetcdfSave.time_netcdf_save_cube(600, True)                                            |
|          | 91.0±2ns                     | 88.8±1ns                    |    0.98 | save.NetcdfSave.time_netcdf_save_mesh(50, False)                                            |
|          | 61.6±0.4ms                   | 61.9±0.4ms                  |    1.01 | save.NetcdfSave.time_netcdf_save_mesh(50, True)                                             |
|          | 89.7±2ns                     | 89.3±2ns                    |    1    | save.NetcdfSave.time_netcdf_save_mesh(600, False)                                           |
|          | 512±2ms                      | 512±2ms                     |    1    | save.NetcdfSave.time_netcdf_save_mesh(600, True)                                            |
|          | 28.3±0.06k                   | 28.4±0.07k                  |    1    | save.NetcdfSave.tracemalloc_netcdf_save(50, False)                                          |
|          | 1.71±0.2M                    | 1.71±0.2M                   |    1    | save.NetcdfSave.tracemalloc_netcdf_save(50, True)                                           |
|          | 28.3±0.07k                   | 28.4±0.06k                  |    1    | save.NetcdfSave.tracemalloc_netcdf_save(600, False)                                         |
|          | 225±20M                      | 225±10M                     |    1    | save.NetcdfSave.tracemalloc_netcdf_save(600, True)                                          |
|          | 41.8±0.3ms                   | 41.8±0.3ms                  |    1    | stats.PearsonR.time_lazy                                                                    |
|          | 9.20±0.2ms                   | 8.96±0.2ms                  |    0.97 | stats.PearsonR.time_real                                                                    |
|          | 24.1±1M                      | 24.4±0.4M                   |    1.01 | stats.PearsonR.tracemalloc_lazy                                                             |
|          | 18.4±0.01M                   | 18.4±0.01M                  |    1    | stats.PearsonR.tracemalloc_real                                                             |
|          | 22.3±1ms                     | 22.2±0.8ms                  |    0.99 | trajectory.TrajectoryInterpolation.time_trajectory_linear                                   |
|          | 59.4±0.4ms                   | 59.3±0.6ms                  |    1    | trajectory.TrajectoryInterpolation.time_trajectory_nearest                                  |
|          | 23.3±0.01M                   | 23.3±0.01M                  |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_linear                            |
|          | 12.1±0.05M                   | 12.1±0.05M                  |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_nearest                           |

Benchmarks that have got worse:

| Change   | Before [8c213f0c] <main~3>   | After [b9a950a9] <main~2>   |   Ratio | Benchmark (Parameter)                                |
|----------|------------------------------|-----------------------------|---------|------------------------------------------------------|
| +        | 226±2μs                      | 284±2μs                     |    1.26 | import_iris.Iris.time_iris                           |
| +        | 3.58±0.1ms                   | 4.69±0.5ms                  |    1.31 | load.ugrid.DataRealisation.time_realise_data(200000) |

Generated by GHA run 11526541587

[trexfeathers]

Expected, as discussed in #6168 (review)