I installed VS2013 (v12.0.21005.1) and added ReSharper 8 (v8.0.2000.2660) a day or two ago. That day it was fine. Now I\'m lucky if I can get it to open one solution in a wh
I had this issue recently as well, and found that disconnecting my computer from the internet when loading the project fixed it. With this, I managed to cut loading times from several hours down to seconds. Since my network cable is not particularly accessible, I simply disabled my network adapter before loading the project (in Control Panel).
This soon became frustrating, however, and I recently looked into the problem again. It seems that logging on to my Microsoft account in Visual Studio ultimately fixed the problem, and I now have no more issues loading projects.
This may work for you as well (if you haven't yet fixed it - but since there is no accepted answer here, I assume that the problem is persisting), so I suggest that you at least try disconnecting from the internet, even if you would rather not enter your Microsoft credentials.
The problem I had was the Perforce connection.
When opening the solution, it would ask if I wanted it to connect to Perforce. Allowing it to try would make it hang and allocate 1.5 GB of RAM.
Not allowing the P4 connection let it load properly (allocating 1 GB RAM). Then I could tell it to connect to P4 after, and it is now fine.
In my case the Fusion log has been enabled. Log files has been growing for months as I forgot to turn it off after investigation. This way the antivirus software started to check these big log files several times during opening the solution, and "Preparing solution..." message is visible for long-long time. When I noticed this, I turned off the fusion log, and problem solved. Solution loads in 10 seconds instead of 20 minutes.