Well, there’s definitely a bug in Default Folder X 4.3.2. When running under Leopard and accessing SMB file servers, DFX will start consuming 20-60% of one CPU and will start to lag or become completely unresponsive. This may also affect Snow Leopard and / or other types of file servers besides SMB.
I’ve got a test build available with a fix:
If you’re having any trouble with Default Folder X, please download and install it. It should fix your problems. If you run into any problems, please let me know as soon as possible at DefaultFolder@stclairsoft.com.
Thanks, and I apologize for the bug (I’ll post the gory details in a few minutes, since it’s an interesting little ‘gotcha’ in the Launch Services API).