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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.

I didnt tested the Clicked event, i work only with ViewModels and MVVM commanding.

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.