Bleh! I updated my post after I realized another problem, and found you already replied back :|
I can't do any testing yet, due to the problem I described in my previous (updated) reply..

I am not really concerned about the speed of the response of the threaded version of this script vs. the non-threaded version. The whole idea was to allow handling multiple simultaneous connections/requests, in case one client is really lazy or slow, I don't want it to delay other clients/requests for several seconds.

Still, I am curious to test it and see the difference, once I get it working :)