Cheapest possible color grading for Quest 2?

Hi, Iam doing something on a Quest 2 and I have my scene setup and working just fine. It runs well enough at 72fps pretty much locked but the moment I apply any post processing (Iam only looking for color grading stuff) it drops by 20 fps to 50s. I've tried using only LUTs but neither the post processing stack, nor any of the other implementations on the asset store help in any way.

Iam using forward renring with the standard pipeline. Would URP help at all?

Does anyone know any tricks to achieve this cheap color grading?