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Found this post, and though it would be worth noting for my development friends.
If you are experiencing slow project close, try switching off participation in the feedback program in Help | Customer Feedback Options... dialog. If it does not help, try disabling component in registry by changing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Packages\{2DC9DAA9-7F2D-11d2-9BFC-00C04F9901D1}
to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Packages\Disabled-{2DC9DAA9-7F2D-11d2-9BFC-00C04F9901D1}
cb5f0d95-e9a8-4174-aa15-b3f125bb6987|2|5.0
Troubleshooting, Visual Studio
visual studio, troubleshooting