Any iPhone, iPad, or Mac with a ProMotion display is capable of rendering buttery smooth 120Hz animations. However, Apple’s Safari browser is locked to 60fps page rendering by default, making scrolling feel noticeably choppier for some users than in Chrome or Firefox. Thankfully, recent versions of Safari include a hidden setting that lets you unlock 120Hz rendering.

At 60Hz, your screen refreshes every 16.7 milliseconds, meaning each frame of a scrolling page stays on screen for that duration. At…

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