Massive graphic glitches with Sonoma (video inside)

I'm having massive glitches after lock screen, especially if i haven't logged in again after a while, like an hour or more. I've had similar problems with Ventura before.

I've also had problem with "glitchy" video playback on websites like twitter.

I'm using OpenCore Legacy pather 1.3.0

Computer specs:
Model: iMac 14,2

Processon: 3,2 GHz Quad-Core Intel Core i5
Graphics NVIDIA GeForce GT 755M 1GB
Memory: 32GB 1600 MHz DDR3
MacOS: 14.1

Any Ideas?