PERFORMANCE
Windows on a VM will never be as fast as when it's running directly on the hardware via Boot Camp. For the fastest possible Windows applications performance, you'll always have to reboot and use Boot Camp. We expected that Parallels and Fusion would perform similarly in our Windows benchmarks, but there was a noticeable difference in a couple of our tests.
We tested both virtualisation programs with 64-bit Windows 7 Ultimate running a 13in MacBook Pro with 4GB of RAM, a Core 2 Duo P8600 processor, a 750GB 5,400rpm hard disk and an Nvidia GeForce 320M integrated graphics chip. The VMs in both Parallels and Fusion were assigned two processor cores, 2GB of RAM and 256MB of video memory.
As a reference, the same MacBook Pro, but with just 2GB of RAM installed to match the VM configurations, managed the following benchmark scores:
Image editing100 points
Video encoding66 points
Multiple applications67 points
Overall score72 points
3D graphics test12 frames per second.
Both virtualisation programs can save a VM's state instead of shutting it down. Resuming from a saved state is quicker than booting, so we tested how quickly each program could resume from a saved state. Our MacBook Pro resumed from hibernation, the closest equivalent to resuming from a saved state, in 26 seconds.
Parallels
Parallels Desktop 6 managed the following benchmark scores:
Image editing71 points
Video encoding59 points
Multiple applications43 points
Overall score56 points
3D graphics test5 frames per second
Resume46 seconds
VMWare
VMWare Fusion 3 managed the following benchmark scores:
Image editing63 points
Video encoding53 points
Multiple applications41 points
Overall score51 points
3D graphics test3.4 frames per second
Resume25 seconds
Winner: Parallels, but only just. Parallels was faster than Fusion in our image editing and 3D graphics tests, while Fusion was much faster at resuming from a saved state. The two were otherwise evenly matched.
Parallels has options allowing you to tweak the VM for faster MacOS or Windows performance, as well as for either faster performance or longer battery life which MacBook owners will appreciate. It would take trial and error to find the right balance with these extra settings, but they're still useful options that Fusion lacks, especially since both programs can feel sluggish on a MacBook when running off battery power.
