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The SfButton Command execution has a delay and is slower than a normal Xamarin.Forms Button or a TapGestureRecognizer on an element.
I made some tests (only in IOS) and noticed that the same Command execution (NavigationPage Push) is deferred by near 140-150 ms when executed with a SfButton.
The same command has a delay of 9ms when executed from a standard Xamarin Forms Button or a TapGestureRecognizer.
140-150ms are a deal. When using sfButton to Navigate, my app feels "clunky" and not fluid.
Replacing the SfButton everything is much more smooth.
I never tested it in Android.