Slow performance of box2d pyramid test

Hi,

i have downloaded the latest version of cocos2d-x, compiled it with VS 2010 and run the tests program.
The box2d testbed pyramid test run on both debug and release mode at approx. 15 fps, while the old version of cocos2d (cocos2d-1.0.1-x-0.9.2)
run at 40 fps (release mode, the debug mode run at similar fps).

Is someone having the same ‘problem’ as me?