Huh? I was about to comment the exact opposite, I was super impressed by how smooth it was!
And that's running on a 3 year old low-end ryzen 3 laptop processor, on firefox in fedora.
That's what I found too, in Firefox. I then switched to Safari and it was buttery smooth everywhere (MBP 16", not M1). Haven't tried in Chrome yet. I wonder why the performance varies so wildly...