Can you run a benchmark, maybe this one, so we can see it it’s really a general thing not just something on that website? Also we can compare it to other computers, or you can see if changing a setting helps at all.
Can you see something strange in about:processes? Shift+Esc is its keyboard shortcut.
Can you try it in other browsers? Something Chrome like (Chromium, Brave, Vivaldi). Does this happen there as well?
Just my troubleshooting tips:
Can you run a benchmark, maybe this one, so we can see it it’s really a general thing not just something on that website? Also we can compare it to other computers, or you can see if changing a setting helps at all.
Can you see something strange in about:processes? Shift+Esc is its keyboard shortcut.
Can you try it in other browsers? Something Chrome like (Chromium, Brave, Vivaldi). Does this happen there as well?
I can’t find anything suspicious but here’s a snippet of it:
I used Ungoogled Chromium and it opens the pop-ups smoothly (so Firefox is causing the problem):
Clip
Why the benchmark is at 90fps? What happens if you lower your monitor refresh rate to 60?
Lowered my monitor’s refresh rate to 60 Hz and it didn’t resolve the issue
Also lower it in the DE settings. Are you on wayland?
I changed it via Debian’s Settings app.
I’m using X11 and Gnome.