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https://lynxjs.org/ doesn't scroll smoothly.

What browser/platform?

Flutter apps don't scroll at 30/60fps on my aging Mate 20 Pro, but that website is fine for me in Chrome.

Chrome on a 2019 Intel Mac.

To be completely honest there is no reason for anything 2D on the web to run badly on any machine over 200 bucks released in the last 15 years.