I'm simply observing the CPU usage of the Flutter app when a TextField gets the focus. I don't see why it matters whatever else may be hogging the CPU as well.
I tried it on macOS as well as on the iOS simulator and on the web, but I haven't tried the latest version yet. You can try the web version here:
I wouldn’t discard it so easily - flutter does all drawing and compositing on its own, without using system libraries. Could easily be redrawing the whole screen.
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There must be something else going on that you are not aware of hogging the CPU. This cannot possibly be the source of that.
I'm simply observing the CPU usage of the Flutter app when a TextField gets the focus. I don't see why it matters whatever else may be hogging the CPU as well.
I tried it on macOS as well as on the iOS simulator and on the web, but I haven't tried the latest version yet. You can try the web version here:
https://gallery.flutter.dev/#/demo/cupertino-text-field
Edit: I have now tried the latest version (2.2) and I'm seeing 12% CPU usage for an idle app with nothing but a focused TextField.
Just out of curiosity; do you see these while running in profile / release mode?
I wouldn’t discard it so easily - flutter does all drawing and compositing on its own, without using system libraries. Could easily be redrawing the whole screen.