For performance you are better off looking at the relational databases such as Oracle or MySQL.In fact, I found another freeware tool, Request Tracker (RT), <a href="http://www.fsck.com/projects/rt/,">http://www.fsck.com/projects/rt/,</a> which I am looking to evaluate in the future.This tool requires you to separately download MySQL and, I believe Perl, though I have not gone through the specifics of setting up this tool yet.BTW, MySQL and Perl