Thank you for your reply. I also have an old I7 2600 that is still rolling along. I will try the High Priority setting which I hope will use all 4 cores.. I am having to go back and re-render many of my early Bryce images as stretching them from the old 800x600 render to now 1920x1080 has resulted in some anomalies. I basically render pics for myself to use as backgrounds. Thank you for your help, Don