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Sounds like something is off somewhere indeed, because on mobile safari it is running very smoothly for me. Cannot tell the exact FPS, except that it is at least 60 or more.
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Or an autoresearch minimizing render times.
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Runs OK on mobile Edge on an inexpensive 3 year old phone (Android, Galaxy S23 5G).

So yeah, interesting indeed.

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Tried it with Firefox running on the same machine and it's fine. Looks like the dev forgot to test with desktop Safari, or my version doesn't support a critical graphics API.
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I used it in Safari and it had good FPS, so it may be due to your specific version, or maybe an extension.
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