So I have a problem with lag and frame rate drops in games. Sometimes it gets so bad that in LEAGUE OF LEGENDS, I get 15 FPS. I'm not sure if it's because I'm accidentally using my A4 5300's integrated GPU or if my Asus 7770 HD 2gb just sucks. Is it because my CPU is bottlenecking my GPU? Please help me with this issue and how I can fix it.