I just upgraded my MacBookPro to Parallels Build 4560 and immediately see a big improvement regarding CPU usage with Vista under Parallels.
Parallels 4128:
Idle CPU Usage bounced between 70% and 107%
(maybe it shows 100%+ because its a CoreDuo2)
Parallels 4560:
Idle CPU Usage bounces between 24% and 47%
These are numbers I'm observing in the Mac OS X Activity Monitor (Parallels Desktop task)
Before - I had to switch to BootCamp at times due to poor performance - now - performance in Parallels is close enough that I will probably stay in Mac OS X with Parallels most of the time.
Parallels 4128:
Idle CPU Usage bounced between 70% and 107%
(maybe it shows 100%+ because its a CoreDuo2)
Parallels 4560:
Idle CPU Usage bounces between 24% and 47%
These are numbers I'm observing in the Mac OS X Activity Monitor (Parallels Desktop task)
Before - I had to switch to BootCamp at times due to poor performance - now - performance in Parallels is close enough that I will probably stay in Mac OS X with Parallels most of the time.