I've has this problem with most cyanogen roms I've run, and I've run a few. 7.0.0 was the smoothest I've run. I've read some posts that recommend using incredikernel, which I've used before but not with nightly 90. So I went from tiamat to incredikernel and I'm at 883mhz with smartass. My screen still sticks when I scroll (the posts I read said nothing about sticky screens, just said the two were a good fit). I've tried all the different governors and speeds and still have the same problem. I really like my setup and would hate to change over something so mundane. Any tips?