The tap response is slow and won't connect to Wi-Fi

When playing games, such as Earn to Die 2 and Coin Dozer: Pirates, the touch reaction is slow, if at all. Causes app shut-down, lag, or total device power off. Also, when using the wifi, it connects to open signals but no internet, such as Cox Wifi or where I work. To be perfectly honest, I'm tech-tarded n ain't afraid to admit it. Any insight would be greatly appreciated.