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FWIW, works great and animates smoothly on a Surface Laptop 4 with 16 GB RAM (Firefox).

Do you have hardware acceleration disabled in your browser?

I checked and I have it enabled. But, I don't have a dedicated GPU, just whatever is inside of i7-14700k. Maybe it's just not up for the task?

That may be it. The page runs a fire simulation, so it really struggles when my hardware acceleration is off.

Weird. I only have 16GB but seems to run fine for me?

Maybe it's Windows? Seems on MacOS it runs fine with much less RAM.

I am on Windows.