Hi Scotty
Hope you are well.  You helped me a few years ago install Parallels on my mac so that I could run Windows.  All is working fine for the most part (it does not move at lightning speed but I have learned to live with it).  I have learned though that if I want to run Face Time I need to upgrade my operating system to Snow Leopard.  Do you know if this will have any impact on my Windows environment, etc.?  Please let me know when you can.
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First, to address the slow speed issue, check to see how much ram you have. If you are running Parallels then you’ll want to increase the amount of ram to the computer’s maximum. Check out www.crucial.com to order the most ram you can.

Now, I would need to know a couple of things”

1. how much hard drive space to you have left
2. how much ram does your computer have (or will have)
3. what version of parallels is running

Depending on those factors, I could then safely say yes to moving to Snow Leopard or not. Parallels Desktop for Mac - Wikipedia, the free encyclopedia states that even up to Parallels 7, you can run 10.4.11 Tiger and still be able to use Parallels so you should be ok. Looks like most builds of Parallels will run in Snow Leopard.