A possible fix for really slow login times in 10.3.6

From macosxhints.com:

Following the 10.3.6 update, a few people out there noticed that it took quite a bit longer to get from the login window to your desktop. Apparently having a large number of fonts installed on your system causes 10.3.6 to slow down during the login process. For some like myself, having 1,000+ fonts installed was killing my machine and causing a 10 minute wait time to log in.

The solution is simply to remove as many as you can. A list of default fonts and their locations for Panther is available here should you choose to revert to defaults. In addition, you may find useful.