If you are using a mac, click on the Bryce application icon. Type command I to get information on the application. If you are running system 8 or higher, use the pull down menu in the popup window to go to memory. (older systems, the memory info will be in the popup window--just change your settings) Change your memory settings (but remember to allow enough for the system). You can give Bryce more memory than you actually have if you have virtual memory turned on. If you are on a PC, don't worry. It will take what it needs.