How To Unlock True 120Hz Browsing On iPhone Pro Models

Apple moved to 120 Hz ProMotion displays a while ago, and for the most part, iPhone users know the difference instantly. Scrolling feels fluid, animations glide, and everything just looks more responsive. But every now and then, something feels off. Especially inside Safari.

You scroll through a long article, mostly text, and it suddenly feels slower than it should. Not broken. Just… not as smooth as the rest of iOS. Turns out, that feeling is not in your head.

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Why Safari Sometimes Feels Less Smooth

According to a report by Tom’s Guide, Safari does not always take full advantage of the 120 Hz refresh rate, even on iPhones that support ProMotion. By default, Safari renders many webpages at 60 frames per second. This is particularly noticeable on text-heavy websites where smooth scrolling matters the most.

That limitation is why Safari can feel oddly choppy in certain situations, even when the rest of the system feels perfectly fluid. Apple has not made this behavior very obvious, which is why most users assume Safari is already running at full refresh rate.

If you are curious, you can actually check this yourself. There are refresh rate test pages online that show the current frame rate while scrolling inside Safari. On many ProMotion iPhones, you will see it stuck at 60 fps.

Which iPhones Can Enable 120 Hz in Safari?

This tweak only works on iPhones with ProMotion displays. That means models starting from the iPhone 13 Pro and newer Pro variants. Standard and Plus models do not support 120 Hz displays, so this setting will not appear or make a difference there.

If you are using a Pro model, the option already exists on your phone. It is just hidden deeper than most people would expect.

How to Unlock Full 120 Hz Scrolling in Safari

The fix lives inside Safari’s experimental settings. Start by opening Settings on your iPhone. Scroll down and tap Apps, then select Safari. Once inside Safari settings, scroll all the way down and open Advanced.

Here, you will find an option called Feature Flags. This is where Apple quietly tests and controls experimental behavior. Inside this menu, look for a setting related to page rendering updates near 60 fps. Toggle this option off. Doing so stops Safari from locking webpage rendering to 60 fps.

Once the toggle is changed, fully close Safari and reopen it. This step matters. After relaunching, Safari should begin rendering pages at up to 120 Hz, depending on the content.

You can confirm the change by revisiting the same refresh rate test page you used earlier.

Is the Difference Noticeable?

On text-heavy sites, the improvement is immediate. Scrolling feels closer to how system menus behave, and the disconnect between Safari and the rest of iOS largely disappears. It does not magically fix every webpage, but it does allow Safari to finally use the hardware Apple already gave it.

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For something that has existed quietly in the settings, it is surprising how much smoother everyday browsing feels once it is enabled.