I rendered a HUGE image just to test how far my computer can go. I am afraid to make an image any bigger, my computer was already going slooooooooow. I rendered at 5000x3333 size. Reached 0.75 mutations per pixel in 30 mins. Average 7500 mutations per second. Obviously- 1000 GI bounces isn't enough. Neither is 100 for maximum number of consecutive rejections in the MLT algorithm. Here is one at 10% size: Lol, origional PNG file was 45.2 MB And I might have crashed Photoshop trying to save it for web Please excuse all of the JPeg compression- you try cramming an image that is 5000x3333 into 1024 KB Here it is: 0.99 MB (PNG was 45.2 MB)