CNet’s Crave has a great writeup on performance of Fusion versus Parallels for Windows virtualization on the Mac. I’ve been excited since Parallels came out about this — especially for my work at Mozilla, it’s fantastic, as it means I can take a look at Windows builds of Firefox, other apps, etc — all with my MacBook Pro. As much as I like Parallels, though, I’ve found its performance erratic — and at times it overwhelmed my system resources. I’ve been trying Fusion lately, and my experience has been a lot better. It seems to perform better, and it’s much better behaved with respect to running other applications. Parallels has a better UI, I think, and its “coherence” mode seems to be better than Fusion’s “unity” mode. But I found using Parallels that I’d often have to restart my machine to get performance back okay — Fusion so far seems a lot better, so I’m going to stick with it for a bit.