I'm running standard 2.1 os and until recently, fairly content with the speed of the phone. Not running too many app's, but over the last week became ridiculously laggy. Restarting barely helped and was getting very frustrated with the thing. So I deleted one app and updated another. Wish I'd done this separately, but my phone is back to being very snappy. Uninstalled flixster movies and updated handcent. Replaced flixster movies with moviefone and things are snappy as ever. I've never had problems with handcent so inclined to think that wasn't the problem, but whatever the case, glad to have a functional phone again.