Notebook KCL file causing noticeable slowdown

[jgomez720]

Description

Something within the notebook file is causing a noticeable slowdown.

Version

v0.47.0

KCL

notebook.zip

Recordings

Screenshare.-.2025-03-13.3_26_19.PM.mp4

[jgomez720]

@nrc feel free to reassign. I've seen you are the performance guru.

[nrc]

Logging some investigation:

• running from the command line, the project doesn't take a huge amount of time to run (though certainly not quick): interpretation time is 2.5-3s, parsing time is under 25ms for each file.
• It's creating 111 memory environments, which is quite a few, but not ridiculous
• It is certainly a terrible experience in the app
• Playing with the code, it seems to be pattern-transforming the paper 100x which is causing the issue
• And back to measuring - changing from 1 to 100 to 1000 repeats changes from roughly 2 to 3 to 4.5s, so not quite proportional, but impacting performance. The ProgramMemory stats are clearly affected by the number of repeats here
• The commands sent to the engine are not affected by the number of repeats - it's just a single command (as expected)
• We are not calling into KCL on every frame of animation, so I think this isn't a KCL issue. I did some casual profiling in the app and nothing jumped out as suspicious (though I'm no expert on JS profiling). So, my current hypothesis is that this is an engine issue and due to the high number of instances in the pattern transform in paper.kcl, reassigning to @gserena01