The lastest After Effects Beta build (23.3x19) includes a performance improvement for selecting layers in the timeline window via mouse click. The improvements should be most noticeable when there are many visible layers in the window. When selecting a layer or layers in the timeline with or without a mod key After Effects should now properly invalidate and redraw only the previously selected layers and the newly selected layers. This will likely be most noticeable when selecting a single layer in the timeline when many layers are visible.
Please let us know how this update works for you or if you run into any problems with it.
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