I was working on a carousel library a few months ago. I had made a few stress-test demos so that I could catch obvious issues while I was adding things and tweaking things.

One carousel there had 16K slides.

On Windows both Chrome and Firefox managed that fine. They scrolled from start to end and back without issue and you could see, I think, all the frames in my 60Hz screen.

On GNOME and X11 (dual boot, so same hardware) Chrome was fine but there were issues with Firefox. I was curious so I logged out and logged in with Wayland. On Wayland Firefox was fine too, indistinguishable from Chrome.

I don’t understand hardware, compositors, etc., so I have no idea why that was, but it was interesting to see.