@senpaiuwwu
I tried that before and it didn't fix it. I did try enabling it again now just to try though and at least it fixed the browser in general being a bit slow and laggy, but video was still choppy and unwatchable on most sites except Youtube
So i opened flags and did ctrl-F and searched for stuff like video, hardware, 264 and such and i tried disabling/enabling a bunch of different flags one by one.
And i think i just managed to solve it by disabling the flag called "Out-of-process SW H.264 decoding"