Mouse Glitch / Lag / Acceleration

Every game works fine and every minecraft version <1.8 and the thing is i get this weird mouse glitch in 1.8 and 1.8.1 my mouse accelerates without any fps drop no its not a problem with my hardware im pretty sure and ive dedicated a gig of ram to minecraft pls help i get good fps on the most demanding fps shooters out there on 1440x900 with a medium preset