If you watch a lot of Youtube, force the video to MP4 so your graphics card can decode it in hardware. Youtube defaults to VP9 but gfx cards rarely support that codec.
Google's wasting a lot of battery life by pushing VP9 onto everyone.
It's true that Chrome/Chromium don't support it. [0]
Linux itself certainly supports it [1], and at least Mozilla have some progress towards it happening [2][3][4], if slow progress.
However, we used to have hardware video decoding via gstreamer and VLC within Firefox as plugins, using VAAPI and NPAPI, so it's still possible to get working today.
