ReSharper is a great development tool that has a lot of offerings, and I generally don’t have complaints about it. The one thing that does irk me, though, is that it can cause solutions containing a large number of projects to load very slowly in Visual Studio.
I found that a simple workaround for this is to just disable ReSharper before opening the solution. This task is accomplished easily in two different ways. The first is to just go to Tools > Options > ReSharper in Visual Studio, and click the Suspend button. To re-enable the interface, click the Resume button in the same location. The second is to use the ReSharper_Suspend & ReSharper_Resume or ReSharper_ToggleSuspended commands in Visual Studio’s Command Window. (Bonus tip! If you need to suspend/resume frequently, map the commands to toolbar buttons.)
adamprescott.net 
Here’s a good post about mapping these commands to hotkeys: http://andriybuday.blogspot.com/2010/06/resharper-suspend-resume.html