Okay
I installed the beta. It did NOT solve the sluggishness problem. The VC display is updating at maybe 1 or 2 frames per second while the tune is playing.
Ableton's CPU meter is at about 8%.
Taskman CPU meter is at about 7%.
After playing my track for about a minute, I got BSOD.
Retrying, I got a message from windows:
"The color scheme has been changed.
The following program has performed an action that requires Windows to temporarily change the color scheme to Windows 7 Basic.
Program: Live 7.0.3.exe
Publisher: Ableton
Process identifier (PID):256"
I'm kinda sad. I'm really enjoying 7 so far, but it looks like I may have to wait before enjoying it too much.
Edit: I just remembered that Live 7 isn't even supported under Vista. I just might jump for Live 8 just to see if it solves the problem.