> Better: Don't be like me, don't touch defaults you don't fully understand ...
Why not? I was hitting the point where my Firefox did an Auto resolution for youtube videos in fullscreen at 480 pixels, half my screen resolution. I was barely able to see something from the video. Of course, i tried to make it fixed at whatever i needed, but i was skipping frames so much that the video was again hard to see. Changing the tuning values like you did got me even worse quality. I am not able (maybe because my ignorance) to understand why such a small projects bond like ffmpeg, mpv, yt-dlp are able to play youtube videos at high resolution without problems, but a big browser can't. Some people are even saying Firefox is on its deathbed. So I turned to chromium, better youtube play but a very slow interface. It was revealed that hdd write was the problem. I moved most if not all chromium writes to a mfs partition and things are bearable now. Until the next move.