After Effects Preview still rendering ungodly slow despite every attempt. Plz help.

I am editing a video in after effects and my timeline refuses to render. It is a raw video, no effects,  on any clip, I have a 120gb of ram, a 3090 gpu, an i7-1200k, no other app are open (except for Spotify and one google chrome tab), it is at a quarter rez,I delete the cache every hour and it still previews at 2 frames a second, even after I let the green slider go beyond where im previewing in the clip. Please help!