Now this is an odd annoyance. When I start up Windows Explorer it takes 5-7 seconds for the window to pop up. When I use the 'Computer' shortcut on the desktop it's almost instantaneous. As far as I know they're both using the same component, and this was not an issue with Windows 7 RC.
I am using the option 'shell:MyComputerFolder' to go directly to 'Computer' in Windows Explorer, but even the default Windows Explorer shortcut takes at least 3 seconds to show up (I know, nit-picky, but still...).
Windows 7 Ultimate 64-bit (from Technet iso, Build 7600)
3 GB RAM
Intel Core2 Quad Q8200