I agree with this last statement. The backend has a _lot_ to do with
this issue. We use an NFS appliance for a backend that we were
experiencing problems with (high latency) that caused the same issue
with large mailboxen.

So if i'm understand right: You are working on this issue?
After correction I can open a maildir mailbox with
40,000+ messages successfully (after about 2 minutes).
The opening is not an issue in this 20Kbox it opens (and sorts)in about 20secs to 2min.
Threading is another question it took 5-6mins.
Using Courier,
server-side sorting, SM 1.4.5. Make sure your disks, etc are fast and
aren't experiencing high IO load and are optimized for reading.
My discs are quite fine, and I use jfs. Of course there is a bit IO load every time, it is a server machine. I will look some tweaks in fs.

Understand so. So I think I will disable server-side threading, the Thread view button disappears so (users can't thread view). And I will give a custom memory limit to php scripts, that users can't do anything nasty with such big mailboxes. I have to let server side sorting in SM, to help quick open the mailboxes. Oh, the whole thing is not an issue with imap mailer client like ThunderBird(I know, that it is another think).

SM is so cool, and It will be so good to have SM handle quick such mailboxes without restrictions.


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