I originally just installed CM10 using cwm update, after reading forums I found out its best to install using Installer3 which I then did. But my android was giving me corrupt graphics and felt flaky. I then decided to remove android and do a clean instal of CM10 using cwm uninstaller.
Clean instal of CM10 is running beautifully feels very stable and no program closes or resets. All apps I have tried are working and video and audio is great.
so anyone who feels CM10 is not performing well, try a clean instal, I going to keep using CM10 now as CM9 builds have slowed right down.
cwm = clock work mod recovery option on boot.
installer3 increases the size of the android system folder to 400MB it should be used for installing CM9 or CM10