Corona Simulator with extreme lags since 639

I have extreme low framerates on the OSX simulator with version 639 and 640. I had to switch back to 638, which works still fine. Any ideas?

thanks! [import]uid: 53732 topic_id: 16447 reply_id: 316447[/import]

Everything works fine now. The solution was simple - a upgrade to Lion :confused: [import]uid: 53732 topic_id: 16447 reply_id: 61464[/import]