if iTween is loaded,the unity3d run very slow.

if iTween is loaded,the unity3d run very slow. not game run slow.when I save the script or press "start",the game run after 10 seconds(Usually very fast). by the way ,my PC's hardware is so good.

That's ok it happens, its because the iTween script is compiling but when you build and run the game the problem does not occurs when you test the game your self other than that nothing is wrong :)