I'm using a project that makes heavy use of expressions. Even though I'm not applying any particular effects or processing, the performance becomes very slow when I go to the upper hierarchy levels. I'm attaching the project file. The compositions become progressively slower in this order: "ALL" → "ALL_Filter" → "ALL_SplitCut".
This appears to be a bug report or support request describing performance issues with nested compositions in an After Effects project that uses many expressions.
https://www.dropbox.com/scl/fi/8k7hn749yq7zhnr27u28t/very-heavy-project.aep?rlkey=0fiyomjdzubpwe9cos...
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