Fps low in new luncher for minecarft jar version 1.5.2

Was playing Creative on server with 1.5.2 minecraft version and i'm using the new minecraft launcher 1.1.2 and make new profile and everything fine with 1.6.2 if i play single player or on server with fps but when i play with the new launcher 1.1.2 and make profile for 1.5.2 version of minecraft then my fps is just low as hell goes from 6 fps to 23 fps no higher but normal fps like it was about 60-120 fps and for minecraft version 1.5.2 if i set it full screen on my OSX then the normal fps comes .....