Help using touch script for iOS

Hello, I purchased the easytouch script that can be found ON THE UNITY ASSET STORE (CLICK HERE) some time back I have begun using it for iOS however I am always having issues and my customers always complain that it is not responsive enough. My game constantly requires users to swipe left/right/up/down but sometimes it just doesnt register in time, are there any suggestions or support that you can offer? Thanks-

Contact the makers. If the product sucks, NGUI and EZGUI are the popular GUI assets.