Fix choppy YouTube video playback in Firefox and firefox-esr in Debian Bullseye - Unix & Linux Stack Exchange https://unix.stackexchange.com/questions/723814/how-to-fix-choppy-youtube-video-playback-enable-webrender-debian-bullseye
I hate to say it, but I decided to try Google Chrome in a Flatpak, and it runs a lot better than Vivaldi, which SHOULD be in a Flatpak at this point (but is not).
Raspberry Pi Zero W is mostly frustration if you try to use the GUI. I forgot how crushingly slow it is. I'm getting the no-GUI build of the OS.