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I'm not sure if it is my oldish (2010) MacBook pro, but the coursor is very laggy.

And I'm not sure if this really improves your UX, it feels annoying just like scrolljacking.

Do you have any data that shows it provides an increase in conversion etc?

Also (very slightly) laggy on my 2014 MBP, even when forcing it to use the discrete gpu.

It is not laggy at all on my HP Probook 6545b, which is pretty crap compared to MBPs.

Thinkpad T430, Firefox under Linux — no lag. I don't think that moving a bitmap over the screen should be slow on 2010 hardware (well, even on 2000-ish hardware). Probably it's just so obscure that browser vendors don't notice / test for small performance regressions.

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