Mac OS X running slow after using Win 7 on BootCamp

I have a mid-2010 27" Core i5 iMac and I've installed Windows 7 using BootCamp. Every time I use Windows, the computer is responsive, but when I restart on Snow Leopard, my CPU is very slow; meaning every time I do anything for the 1st time, wether it's opening an app or widgets, the CPU responds very slowly. After experiencing this many times, I've uninstalled Windows and now that I have only Mac, after using it for 1 time, everything is as fast is it first was when I got it. Any ideas on why my Windows slows down my Mac partition? Thanks.

This is being mentioned ever since 10.6.6 and shows up in one or two threads or comments per week.
No idea what happening, but my best guess of steps to improve seem useless (backup, format, restore etc) and seems everyone has tried changing startup disk back and forth, and zapping pram and resetting SMC are also of no use.
Does not happen when a drive is not split and are able to have OS X on its own drive and Windows 7 on a different hard drive - not everyone can, though with SSDs there are more possibilities

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