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Description
Running the game above 60fps results in doubled frames. GPU usage looks like it's rendering more frames (38% usage at 60fps, and 82% usage at 144fps), and Rivatuner reports higher than 60fps, but there's only 60 unique frames a second.
Here's a video recorded at 120fps (max framerate OBS can record at), and if you step frame by frame you can see every other frame is doubled.
Screwing with kMaxPhysicsSubSteps and GAME_TIMESTEP can result in >60fps (Video), so I'm guessing the game world is only running at 60fps, and either needs to be increased when running at higher framerates or interpolated.