[Dovecot] Very slow select() command on large mailboxes

[Sebastjan Trepca]

Hi,

I'm trying to decide if I could use you mail server in our enviroment which 
has about 10k users and mailboxes size about ~1GB. 
So I made a few tests and it all worked quite fast, except that select 
command on large mailboxes. The first time I select a mailbox which has 10k 
messages it takes about 4s to process. I am deliberately trying this on a 
Celeron 850Mhz, 512 MB memory and some shitty hard-drive to maximize the 
times.
So why is this so slow? Does it index the messages on select? It's even 
slower when I have some new messages in folder, more that I have more I 
wait. So I presume it must be something with indexing? Anyway, how could I 
optimize this? Why don't you index when a mail arrives instead of on select? 


Thanks for help and keep doing a great job with Dovecot.

Sebastjan
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