I was processing large images with the most recent version of CP (r11710) on my computer, which is Windows7, and it was very slow, almost crashing. A friend of mine had a Mac and we just wanted to try it on his computer. We found that the program runs much faster on Mac than PC. Since then I tried very powerful PCs (Win7 and Windows server 2008), kind of supercomputers, and they still do weaker than an ordinary Mac! I was wondering whether anybody has noticed this difference, and wanted to let the developers know this, maybe there is a way to make it faster on PCs.