I’ve been struggling with Cycles under Windows for a over week now. I have a couple of windows 7 boxes rendering next to a few macs. The Windows versions of blender/cycles are rendering at roughly 2-3x slower than they should be (comparable to the relative speeds they get using Mental Ray or Blender Internal).
After a little research and help from some of the users on this forum, I found that Cycles’ render speed is affected by the type of compiler that was used to make the Windows builds. Apparently, you need a gcc compiler for Windows in order to get a non-crippled version of cycles.
Yet no one seems to care at all that cycles is crippled in Windows. No builds on graphicall to address it, the official builds don’t address it. This is a MAJOR issue, but no one seems to know or care about it?
And no… I can’t just switch to Linux.