Parallels + WinXP causes Excel 2008 (Mac) slowness I have a problem that I've only been able to reproduce when using Excel 2008 for Mac combined with Parallels. When Parallels + Windows XP are not up and launched, Excel 2008 behaves normally. After launching Parallels (running Windows XP Pro as the guest OS), Excel 2008 becomes sluggish. Any sort of operation -- even basic entry of data in cells -- lags seconds behind. It is, in short, not useable. Note that the sluggishness doesn't happen when Parallels is simply launched. It only occurs when the guest OS is booted. If I "pause" the guest OS in Parallels, Excel for Mac goes back to behaving just fine. I have tried changing the memory settings in Parallels, to no avail. I am working on a 2.2Ghz MacBook Pro that has 4GB of RAM, so I'm certain that the machine isn't to blame either. Has anyone experienced similar problems, and if so, have you identified a solution? Right now, this is pretty crippling for me.... Thanks.