Bryce file size on mine was not that big for this one, only about 80mb. Notice the filesize on the render BMP is about 57MB. If you do a Bryce render to disk at your proposed size be sure you have around 1GB or more free disk space to hold the BMP file. Once it renders you can save it as a jpg and only take 4-5MB but you'll need 200-300MB for the rendered file plus some space to do things with it and save it. Nothing sucks quite like doing 2 hours of postwork and doing a save only to find that you have no room to put it on your drive. I also get to about 300mb bryce files and my computer starts to groan. It takes hours to save and the screen takes a couple of seconds when I move the camera. That can be fixed with ram. I usually only render these files at 1600x1200. I do post at double the final resolution then scale to 800x600 for the challenges/etc.