Tremendous lag in edit mode (using blender 2.65)

I just started using blender 2.65, and from the beginning there has been considerable lag in edit mode. Everything I do is a step slower. In order for me to see the effects of the one effect I have to go one step ahead (usually i just switch to front view and it fixes). But recently it has been lagging even more and its hard to use. Any help is greatly appreciated.

I am using and Intel I3, 2.30 GHz, and I have intel graphics hd 3000

I have 8 Gb and 64 bit

I have noticed that it happens outside of object mode to a lesser extent as well.