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What Actually Happens When You Tap an App Icon?

by Rockey dev.to

7 min read

What Actually Happens When You Tap an App Icon? A system-design tour of Android and iOS launch, process isolation, the first frame, and how to keep startup fast across native and cross-platform apps. Tapping an app icon feels instant. Behind that tap is a carefully constrained handoff from an operating system to an untrusted application: process creation, sandbox enforcement, runtime initializati…

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