Performance below expected

I'm getting this issue for a long time, my FPS average is 60 but it could be better. My friend have a Intel Pentium Dual Core working with a Radeon's worth graphics and getting more FPS (130). My CPU usage while running the game is about 65% an the gpu is about 25%. I've waited a long time for a solution/update that may solve my problem but nothing solved it (I hope so) yet. On multiplayer my FPS average goes down to 43.