We tested it in mobile, but several people pointed out that we have more performance work to do to make sure that the animation is fast on lower-end hardware. I don't know what phone you're using, but we'll get it fixed regardless.

1 more data point - it's very slow on my desktop which has relatively high performance as well. Using Brave if that matters.

We're about to push a change that should improve this a bit, thanks for the reports!

One more data point--I'm using Firefox on an M1 Mac mini (MacOS 15.7.7), and this web site destroys the responsiveness of this system in a way I have literally never seen before (4+ years) from anything, web site or otherwise.

I opened up Activity Monitor and CPU use looked normal but it showed the GPU was pegged at 100% as long as that page was open.