Originally posted by TemplarGR
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Playing Full HD video in "legacy mode" would produce about 130 % CPU usage in htop figures. With hardware acceleration this would come down to around 90 %. However, when hardware acceleration is enabled, I would see Mutter consume around 10 % constantly whereas without it Mutter stays at around 2-3 %. So there is some weird compositor-related overhead on the Gnome desktop / Mutter.
Note: Above figures are summed up and include all Firefox processes. This means the main process and some renderer processes.
When I play Full HD video in MPV, CPU consumption is around 20 %, so in my mind this should be target for Firefox as well. These numbers are under Wayland; on Xorg a video player hardly consumes any CPU time. So there is overhead even with regular video players when on Wayland. Based on this Firefox might actually perform a lot better on Xorg once it gets hardware acceleration support as well.
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