vNext-project slow and shows warning for long filenames in node-folder

[olofd]

Hi!
Just for fun I was trying to convert a medium-sized web-project to vNext.
I Have a node_modules-folder in my wwwroot-folder (Have some client-deps there)
and when I open the solution (which is very slow after installing my 30+ npm deps and 20+ bower deps)
I get this warning.

The warning appears everytime I start VS.

[olofd]

Maybe should say that I use VS 2015 Ultimate Preview