After installation, I recommend heading to
Black Viper.com for Registry tweaks to improve performance. I have been using BV's guides since Windows 2000 to improve performance of my PCs, and they have been a great help.
When I upgraded my PCs to Windows 7, I found performance significantly impacted compared to Windows XP, but after using BV's "Safe" config, the performance improved almost back to where it had been under XP.