osu!taiko Argon skin causes stuttering on long maps #32743
Description
Type
Performance
Bug description
When playing a long taiko map (~20 mins on my machine), the notes gradually start lagging upon each hit, creating an unpleasant and disorienting effect (see video below). This can be reproduced by taking a long map (e.g. this) and scrolling to the middle/end via auto.
To investigate, I profiled auto playing at the start of a map (trace-normal.zip) and after a long time (trace-slow.zip), which can be viewed at https://www.speedscope.app/. This seems to indicate that the issue stems from updateStateTransforms in the Argon implementation, which eventually calls UpdateTransforms, which presumably iterates through a growing list.
I also noticed that the triangles skin has similar stuttering, though I didn't investigate further. Legacy skins seem completely fine.
Screenshots or videos
taiko-stuttering.mp4
Version
2025.321.0-lazer