parallel_for slow inside visual studio

I use parallel_for from ppl.h and when I run the program from visual studio (2010) both debug and release version they run quite slow compared to running the executable from outside visual studio. Is there some option that I can disable, only in the release version maybe, to run the program faster inside visual studio?

Solution

You can try running the program without the debugger being attached to it. In C++-Mode the shortcut for that is CTRL + F5.

If this is still slow, there may be some environment variable that is (not) being set when run from Visual Studio but when you run it outside of VS.
If it's fast now, then the attached debugger probably slows your application down. If and how this can be improved depends on your project type, i.e. programming language, I guess.