ntrpgcon, how many total registrations did you have today? Did you have 1 duplicate in 10 total? 100 total?
This is an issue that we've struggled with in the past as well. We had a large event open last night at midnight and had 5 duplicate registrations today in a total of about 1050 registrations (so far). For us this has been a success, last year we had over 50 duplicates in this event. So while it's not perfect it "seems" to be getting better.
Do you think your duplicate rate has gotten better with the last few updates or held steady?
Prior to moving to v3.x I was running v2.67 for a few years... if I had a duplication it was on game day when over 200 people register over 8 times each for games in about a 5 min period.... I'd end up with a few duplications, I could live with that, the server was pounded for 5 min...
Since I had been running the same Ubuntu Linix, Joomla 1.5 since 2009, decided to "upgrade"
Created a brand new Debian install, new Joomla 3.x, DTR 3.x all last October... made all users re-register on the site... so it wasn't an upgrade, it was a new server...
Now I get them like this:
March 31 - 2 registrations, 2 duplicates (they had already registered back in October)
April 12 - 1 registration, 1 duplicate (he forgot he registered on April 5th)
These are the registrations over the last month, and since they are all new to the event, nothing is duplicate... but if anyone of them forgets and tries to register in May, I will presume they'll become another duplication.
April 02 - 4 registrations - none duplicate since they had never registered for the event before
April 03 - 3 registrations - none duplicate since they had never registered for the event before
April 04 - 10 registrations - none duplicate since they had never registered for the event before
April 05 - 5 registrations - none duplicate since they had never registered for the event before
April 06 - 3 registrations - none duplicate since they had never registered for the event before
April 07 - 2 registrations - none duplicate since they had never registered for the event before
April 09 - 1 registration - none duplicate since they had never registered for the event before
April 10 - 1 registration - none duplicate since they had never registered for the event before
April 11 - 4 registrations - none duplicate since they had never registered for the event before
The system is allowing people to register for an event when they are already registered, and they are the only one trying to register at that time.
Thus the worry that when game registration opens Thursday night and 200+ people are hammering the server trying to get into 8+ games each in a 5min period, I fear with all the screen refreshes/reloads etc I will end up with tons of duplicate records unlike my old reliable 2.67 that only had a few...