Hi Primus the patch is working fine on my mac. fyi - It might make sense to add in some Mac.os.x Q&A to have all windows closed, as otherwise the script will break (.DS files cannot be deleted). btw - after I turned on all optimizations in Clang on, the frame rates became quite impressive (>80 frames/sec for medium sized scenarios). Yet, the mail loop seems to know no idle and/or timers so that at least on the mac 100% CPU is burned even if no units are moving, etc. Would you know the name for the main loops where I could tweak that myself? Cheers Ed