My droid-x seemed to be very slow, so I found an app called "System Monitor" to try and see the cause. CPU at 99% probably from running the current version of Titanium Backup.
It has a nice widget which shows many items and can update as fast as every 5 seconds depending on the settings.
However, when one presses on the widget, it kills processes to make more free memory.
Not sure how it all works, but it is interesting.
I also put it on my Rezound.