That's very strange, what CPU/GPU are you running on? Also could you try if it runs faster in a different browser on the same computer?
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That's kind of surprising, I'm testing on Ryzen 3900x and RTX 3060, so a very similar setup, and running at completely stable framerate. I don't think it's the 2070 Super that's causing the issues, tho maybe look into updating your Nvidia drivers if you haven't in a while. I'd still be curious about other browsers though. I'd imagine it might be Brave's fault, but ... one never knows.