The iPhone 13 Pro Max was launched with a ProMotion screen. The displays support refresh rates of up to 120 Hertz. However, in order for apps to be able to display 120 images per second, they must first be optimized for the new panel.
If an app developed for iOS 15 has not been adapted accordingly, the content will only be displayed with a refresh rate of 60 Hertz. Standard elements of the user interface are an exception. For example, some animations are automatically displayed at 120 frames per second. This includes, for example, scrolling through the application. For other animations, the developers have to adapt their code.
According to 9to5mac, app developers who want to adapt their software for the ProMotion display have to edit the plist file and provide it with an additional entry. This tells the operating system that the app relies on the higher refresh rate. This is supposed to extend the battery life of the iPhone, since only apps with 120 Hertz are displayed if they actually need the feature.
Additionally, an issue with Apple’s core animation technology has emerged in the past few days. A bug causes problems with the refresh rate. Core Animation is an interface that can be used to create animated user interfaces. Until the manufacturer eliminates the problem with an update, transitions based on core animation will be played at 60 frames per second.
The problems with the 120-Hertz playback should not be the only point that Apple should fix in a future update. Some users can no longer unlock their device with their Apple Watch after a backup has been restored. It is not yet known when a patch will be made available.
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