First thing to do is check for the latest updates on your Video card - even if it's new! Vid cards rarely have the latest when they first install. If that doesn't help, Hmm... how much poser stuff do you have, and is it all in the main Poser directory or do you have more than one runtime? If the Poser directory gets too full it could possible be slowing things down. What settings are you using for Firefly? I can't tell you which ones, but someone else can probably advise you that certain settings can cause problems. Have you tried rendering with the Poser4 Render Engine? It can be just as good as Firefly for simple scenes, and faster, less chance of locking up.