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Question #150EasyPerformance & Optimization

Difference Between a Cold Start and a Hot Restart?

Answer

* The key is that a **Hot Restart** does not kill your application's process. It re-uses the existing Dart Virtual Machine (VM) that's already running. A **Cold Start** begins with a completely new process. * **Cold Start (First Run)** * A new application process is created on the device. * The Dart VM is started. * Your `main()` function is executed from top to bottom on a clean slate. * The initializations run, and `runApp` is called. * **Hot Restart** * This is a two-step process inside the already running app:
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**Teardown (The Hidden Cost):** Before `main()` can run again, the Flutter framework must tear down the current state (disposing of widgets, states, controllers, etc.). This cleanup process takes time and is the primary reason for extra delay.

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