I am trying this on a large board (90K users), and it's taking forever for each screen to finish sending to the mailqueue. I tried 500 users per time, and it took a minute or more for the 500, and then you have to hit "next" so I was looking at a couple of hours of this.
So I stopped, upped it to 10K users per pass, and now it's just taking several minutes for each 10K pass.
On the outbound side, server load is very high, so I have reduced it to process 3 on each mailqueue pass, that seems to help a little. But the site is at a crawl. We have 2 web servers and a mysql slave setup, if it matters.
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