10 seconds
per account? What the fuck.
The numbers are kind of variable here (seems like it's been down lately?) but I'm going to guess that SMF's registration process is easier to spoof for whatever reason. At least mass-flagging accounts is fast and simple, though. Pretty much just tick a bunch of boxes, tell it what you want to do to the account, and it flies through it. And hey, maybe when SMF 2.1 comes out in ~2063 it'll have better spam mitigation so that won't have to happen as much.
Re: integration issues. This is why I thank my lucky stars that all of my experiments with various portals and other forms of integration way back when didn't really go anywhere. DMZX is a bit of a special case in that it needs that integration, but in my case it would have only complicated my life with pretty much no gain whatsoever, lol.
Even so, it kinda feels like you can easily convert
to SMF, but going to anything else is a bit of a process. Like, switching over to phpBB would require me to convert to phpBB 3.0 (which needs to be done on a box running PHP 5.x

) and then stepping up from there. I did it once on a test VM and it wasn't pretty. One of the downsides of PHP gittin' gud, I guess.