All the bells and whistles of the new interface come at quite a price. Granted my development machine is no spring chicken (I'm still rocking an ancient Core 2 Duo), but Xcode 3 performed lightning fast. Opening new tabs or one of the seemingly infinite side bars in Xcode 4 (more on that later) chug along with what I could imagine would be nice animations if they weren't so slow and choppy. Quick info that used to be available at the whim of a key command, such as opening the Debugging Console, now require a button press and a wait through a sliding animation.
I don't usually hear my MacBook Pro fan working this hard unless I'm playing a game or browsing a Flash site. Again, I know my laptop is on the older side, but I should really be able to write code and listen to iTunes without experiencing skips in music. Perhaps all the new constant background error checking is the culprit- I admit it could be kind of cool but does anyone know how to turn it off?