Yes, I am having the same problems since the upgrade. I am hearing that there will be another smaller upgrade coming within a few months that hopefully will resolve these irritating issues.
Are you using the stock launcher? I'm running Launcher Pro which was a little sluggish at first, but I added Spare Parts (free app) and tweaked the screen transition settings (General > Window and Transition Animations) and things work great!
I have similar problems with notifications, but it's a minor issue.