I have finally figured out the cause of super slowness in my phone, basically going up from 50% CPU to 100% steady. Evo is fast, perfect. If I enable 4g, the phone becomes super slow. Sliding screens is painful, scrolling painful, pretty much unusable. If I disable 4g, is remains super slow. If I reboot the phone, all is fast again. (you can also use a task killer to kill all except sytem tasks). Saw a thread on another forum for the same issue, thought I would bring it here: 4G slows down my phone - Android Forums It is definitely a problem.