Visual Studio 2010 Very Slow

One morning I fired up Visual Studio 2010, opened one of my solutions and found that the Visual Studio user interface was so slow as to be completely unusable.  It took 5 seconds+ for each key stroke to appear, or to switch tabs or to do just about anything in fact.  But only for this one solution.  All of my other solutions seemed to be fine.

After spending a considerable amount of time in Google I finally found the solution to the problem.  I deleted the .SUO file in the main solution directory and the speed returned to normal.  No idea why.

Apparently, the .SUO files contain user dependent information, like the state of the solution explorer (collapse all nodes, close the solution, delete the file and  you’ll notice that the nodes in the solution explorer are expanded again).

One Response to “Visual Studio 2010 Very Slow”

  1. Paul Says:

    Huh. That seems to have fixed mine, too. I’m working on a solution that was upgraded from VS2005, so I wonder if the .SUO contained something from the older version that VS2010 didn’t like.

    Thanks for the tip!

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