The issue is likely that in Qubes OS you don't have hardware acceleration. The bottleneck might very well be single thread performance, though your tips are wor

The issue is likely that in Qubes OS you don't have hardware acceleration. The bottleneck might very well be single thread performance, though your tips are worth a try. For me it depends on the specifics of the video, usually ~10 Mbit/s 1080p x264 and YouTube at 1080p is mostly ok, but I don't even need to try 2160p content. (i5-9500T)