Over the last couple of weeks i have been adding support for building blender on windows with clang (as an alternative to the Microsoft compiler)
It gives about a 10% speedup when rendering on the cpu compared to the ms compiler, however since openmp support is not in yet, simulation stuff will probably run a lot slower. anyhow if you want to play with it there’s a master build of 2018-05-28 available here.
benchmark away 