> AMD® Ryzen 9 5950x, 32 GB RAM, Linux/Fedora 35, Firefox 97.0, Chromium 96.0.4664.110
Same CPU in my Windows workstation and it's plenty smooth. Not just usable, but smooth. This is at 4K.
Do you have a modern GPU, or something quite old? Or do you have browser hardware acceleration disabled?
If not for your GPU, it's also possible that Linux simply performs significantly worse than Windows for whatever reason.