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People naturally multitask on their devices. Whether they’re switching from app to app, bringing together apps on iPad using Slide Over or Split View, or creating multiple windows of the same app, they should be able to pick up right where they left off — and UI state restoration is a core part of making that experience seamless. When your app goes out of view, the app’s process is typically put on pause; it’s not given any more CPU time, which keeps the processor free for other tasks. If your a...