First of all, thanks Rick and other developers for providing such a great software! The ant-matching effect is much cooler than the one in Photoshop, but it does cause too much CPU usage on my computer. The worst case is when you use magic wander tool. Normally this will generate a pretty complicated selection area which causes a 100% CPU usage and slows down the whole system. So i guess it'll be great to have an option to turn it on / off. Another problem that is related to selection: When you make some multi-selection (make a selection first, and then start a new one while holding Ctrl key), you'll find that it becomes unbearably slow. I'm using the latest Paint.Net v3.01, on an XP Professional, P4 2.8G, 1.5G RAM system. Thanks!