The explanation is the sluggishness of WinMo and the half-Gz processor in my Tilt2. The problem is that I know ATTs Nexus One has it's problems as well, like the color offset, etc..
The main selling point for me (and maybe Nexus' owners can persuade me otherwise) is the interface responsiveness.. Delays of 500ms+ are unacceptable for me.. I'm ashamed to admit it, but iPhone still has the best responsiveness for me. It's just so damn fast to respond to every to.
How is Nexus One in that department? Hopefully some owners can chime in...
P.S: don't tell me to try other ROMs, I tried them all. A week of syncing with exchange and gmail make any rom too slow for me. If it takes 1second+ to load an email - thats way too slow for me.