title: Visual Studio 2015 slow while editing and debugging
body: <p>I'm having trouble with Visual Studio 2015 Pro for one specific solution. The solution is a ASP.Net Web Forms application with 10 projects. The following problems only appear in this solution:</p>
  
  <ul>
  <li>Closing the solution takes 20-30s</li>
  <li>Opening the solution takes 1min</li>
  <li>VS becomes completely unresponsive while opening/closing the solution</li>
  <li>Typing has a small lag (~200ms)</li>
  <li>IntelliSense for c#-Code also lags</li>
  <li>IntelliSense for JavaScript does not work at all (might be an unrelated issue though)</li>
  <li>Opening an .aspx file in designer takes 5-10s</li>
  <li>Stopping a debugging session takes 15-30s and VS becomes completely unresponsive during that. Staring the debugging session is actually faster than stopping it.</li>
  </ul>
  
  <p>When I was using VS 2012, these problems did not appear. I got the described problems under Windows 7 Pro and Windows 10 Pro. Reinstalling Windows and Visual Studio did not help either.
  For other solutions (Windows Forms, WPF), these problems do not appear. I have also tried to delete the project's *suo file, which is known to cause perfomance issues when it gets too big. Strange thing now is that VS does not create a new *suo file in the project directory. My development machine is surely fast enough to handle the project (a few 100k LOC). I'm not using any 3rd-party plugings like ReSharper. Other things I did while troubleshooting:</p>
  
  <ul>
  <li>Disable code lens</li>
  <li>Install all available updates</li>
  <li>Cache debugging symbols</li>
  </ul>
  
  <p>I have tried several possible fixes found via Googling, but nothing helped so far. Does anybody have another suggestion what the cause of the problems might be?</p>
  
  <p><strong>Update</strong>:
  Deleting all breakpoints using the function provided for that fixed some of ther problems. I can now open/close the solution within &lt;5s and starting/stopping debugging now goes smoothly. However, input lag, designer lag and problematic IntelliSense still persist. Deleting contents in "AppData\Local\Microsoft\VisualStudio\14.0" did not help.</p>