[Fractint] Lazy XP or what?

When rendering big images in my brand new 3.2 Intel, 1 Gb ram etc, (finally I bought something new), in video=SF9, the first lines come at once. Suddenly the image began to be plot pixel-by-pixel, as if the machine is dozing. You must "wake" it. Click "enter". The machine startle and it becomes alive. The next 50 lines come at once, then comes the dozing phase... and I have to do the mechanical "enter" some 5-10 times for each image. Is that normal under Windows XP? Is there another automatic command I do not know? Thanks Marcus