Yes - select "Faster Rendering" in the View menu (or in older versions this was called "Draft"). This will slightly reduce the display image quality (the picture will be a little softer), but it will update much more quickly. Don't worry, this option has no effect on the image quality when the images are saved. If PortraitPro still runs too slowly, make sure you have enough RAM (2GB minimum recommended). Other than that, you need a new computer!