My 100 MLOC figure is incorrect. The blog post actually states: "With upwards of 50 million lines of code, broad changes to Visual Studio can take some time to fully incorporate."

Here's the link: http://blogs.msdn.com/b/visualstudio/archive/2012/06/20/the-...

For what it's worth, I'm currently working on a number of C/C++ projects that amount to ~15MLOC. Visual Studio handles that load just fine.