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hmmm it's good in my 12+ year old laptop in firefox.

Yeah, I have to wonder if something else is going on with your machine/browser. Runs absolutely perfectly on my 2015 MacBook Pro.

I bet you don't use the Safari Browser. I checked again with Firefox on Mac and I didn't notice any performance issues.

Fine on a 2015 Thinkpad running Firefox on Fedora.

A product is poorly-advertised indeed, but which product?

Lags while scrolling on a 2021 MBP as well.

[2] crashed Chrome 3 times. Mac Monterey.