My daughters hero has been getting more sluggish. It was updated a few months ago and she hasn't really used much of any widget but the phone is plain sluggish and frustrating. I don't know how to go about fixing this.
There's a memory leak in one or more of the apps Sprint force-installed on the Hero. They're promising an update in Oct 2010 to fix it.
Meanwhile you can manually close 'SprintTV' and/or 'CM_service' to restore usable memory. I have a desktop shortcut to About Phone > Running Services which allows you to check memory and kill these unneeded apps.