title: DbContext is agonizingly slow after bulk operations
body: <p>It seems as if the DbContext in the EntityFramework keeps getting slower the more operations (add, delete, modify, querying) you execute on it. Calling periodically SaveChanges() after a few operations won't fix that problem. The only workaround is to dispose the context and regenerate it.</p>
  
  <p>To convey an idea to you: A process, that makes use of one DbContext needs about 4 hours whereas the code with the workaround needs just about 45 minutes, so it's really significant! Is there a reason or switch I don't know?</p>