D-Programming-Language/dmd — pull request #4176 by rainers (2014-11-28 19:55:34+00:00)
Title: Reduce build and run time for test suite on windows >10%

Spawning through the command shell is a time killer, executing compiler and tests directly saves more than 10% for Win32, probably more for Win64.
Let's see whether this also makes a difference for other platforms...