Visual Studio 2013 Intellisense is REALLY slow

Make sure you disable any 3rd party plugins. sometimes 3rd party plugins cause this.

For example i used to have the same problem becuase i had CodeMap plugin enabled.

That being said, visual studio 2013 isa bit slow, but you should not be having the problems you are describing

interesting read on visual studio C++ performance : http://yosoygames.com.ar/wp/2013/12/microsoft-we-need-to-talk-about-visual-studio/