I was experimenting a high CPU usage with Visual Studio 2017 after debugging sessions, something like 25-30% CPU while Visual Studio was idle.  Turns out that the solution is quite simple:

  1. Close VS
  2. Using File Explorer, locate the project's folder that gives you the high CPU issue
  3. Locate the hidden .vs folder
  4. Delete the .suo file
  5. Restart VS
That's it!