After Effects Beta adds Composition Profiler to show what layers are slowing you down.

Adobe has added Composition Profiler to it’s beta of After Effects as it announced in it’s BETA Forum. You enable it by clicking the snail in the lower left of the timeline window and it will show render times for each layer so you can can see the render times for each layer and know which layer is slowing you down.

This is very cool. Just a great feature so you can quickly see what is slowing you down.