In recent build, it takes much time selecting element. especially edges.
I have to wait for minuites to select one edge in complex polygon model.
I am using Windows Vista and there is no problem in the previous build.

Hope soon be fixed.

Offhand, I can't imagine them being any particular slower. It is possible that you've changed video drivers in the meantime? Which two builds have you tried?

really, it works smoothly even on this crappy macbook pro machine

In your Viewport Display options do you Projected Textures ( in the Misc. folder ) turned on? Turn that off, I have found it slows down viewport interaction very seriously.

probbins/ No the option is turned off.
Any way, there seems some problem in my PC.
I will have to find out befor I continue my work.