I have some problems with my MacBook. When I try to play game my mouse lags and mouse clicks are not recognized every time. Sometimes I need to double click. This happens while I'm playing games on my Mac. The mousepad and external mouse e.g. Magic Mouse are both infected. Any help would be appreciated.
This mostly happens if you have third party application installed which is listening on the mouse click and will affecting the mouse input. For me it was a mac app called Magnet which let me not click in the right way while playing games.
Simple shutdown this app Magnet while playing. It will fix the mouse lag.