Preview not working properly, always renders every frame despite no changes to content

[default8lltn43k6h73]

Hi,

I'm working in AE 2021, Version 18.2.1 (Build 8).

I'm finding that my prieviews aren't working efficiently or correctly, as for previous versions. If I create a comp with numerous pre comps, and preview, It renders the preview as expected. If I then make a small adjustment to the contents of just one pre comp, AE always re renders every frame of the parent comp.

Any suggestions?

I have cleared my cache etc but it doesn't fix it

[Mohammad.Harb]

this should happen everytime if you make a local edit to a pre-comp and preview the global comp. 

try using region of intrest to preview a portion on the comp