Slow response UI buttons in Android

I’m facing a problem with the response for the UI buttons, in the unity editor the click event is so fast as expected, but when I install the .apk in my device there is a delay between the touch in the screen and the response in the button. I thought perhaps the method that was calling in the button but I tried also without any object to call and I see the button still response slowly, perhaps the fps in the game…? How can I improve my UI buttons response?