In my early days on Poser, I used a Mac. I didn't have the proper amount of RAM, but I could still use Poser thanks to something called Virtual Ram. Basically, it's just designating a portion of your harddrive to act as RAM. My renders crawled along until Poser 4 came out. I upgraded my computer and made sure I had enough RAM. Firefly seemed to fly back then. I am no longer on a Mac. Moved over to a PC. And in case you're wondering, I still love Macs, but I admit I do have a new appreciation for PCs now.