Issue with a lot of files in a folder.

Folks, I tried using Xee 2.0 (on Leopard) to manage a folder that had about 1,500 images. As soon as I started Xee, it would crawl to a stop and the CPU would spike to 100% and stay at that level for few minutes. When I would delete/move files, same thing would happen... it would beachball and CPU would hit 100%.

Anyone know what's causing that?