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I was running on Firefox and I have a Ryzen 7 5700g (but my cooling is not good)

I see. If you could switch from FireFox to Google Chrome or another browser then you should be able to see huge improvements in performance! Not just for Project Needle, but for any HTML game you try running on your end. FireFox values privacy over performance more strictly than other browsers, and so it takes a lot of extra steps while running HTML files.