I upgraded to 4.1.3
I noticed is it takes maybe 5 minutes after pressing 'Start' for the server to actually start displaying text and start.
Also every certain amount of time it grinds to a halt, and people aren't able to log in. I'm not sure what it's doing, but when it starts doing that it can take a long time for it to go back to normal. Normally I just shut it off and turn it back on, but it just takes so long(due to the bug above).
Windows server 2012
I have 151,577 registered users
I only have only about 50-300 on at a time.
I've been using openfired for like 4 years and have just been updating each version since then.