I do a lot of single frame renders out of AE, which usually used to take a fraction of a second. Ever since this last update, I have noticed it now takes up to 10 seconds per render as it goes through about 500 "Render items to check" before it completes the render. Any idea why this is happening? I'm on a Mac with El Capitan running AE 2015.3
AE has always behaved this way, the preflighting has just become more thorough in recent versions e.g. due to different handling of image sequences and certain DynamicLink stuff.