How to get the touch controls to work smooth and properly in FPS android gamemobile Game?

I have make a android mobile game but my controls not work properly when i run game in Unity Engine it works great with Keyboard but when i build apk for android and run on my phone then control not work properly it stucked when i look around with touch when i press button then the result occur late and effecting my last click for a long time what should i do,the controls are not smooth what should i do to make my mobile game control fast and smooth for good player experience Please Guide me please pleaseā€¦

Please specify your problem, eg. upload your scripts and describe your problem.