Flutter aims to provide 60 frames per second (fps) performance, or 120 fps performance on devices capable of 120Hz updates . For 60fps, frames need to render approximately every 16ms. Jank occurs when the UI doesn’t render smoothly.
Read moreDoes flutter use VM?
During debug mode, Flutter uses a virtual machine (VM) to run its code in order to enable stateful hot reload , a feature that lets you make changes to your running code without recompilation.
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