>>> I'm using courier-imap with roundcube.  Browsing email is fast with
>>> just 1 or 2 users but becomes extremely slow with 5 users.  How should
>>> I look into improving performance for multiple users?
>>
>> By determining exactly where the performance problem is. There could be
>> several reasons: insufficient bandwidth, insufficient memory,
>> insufficient CPU; or a few other things. "Improving performance" is not
>> just some button that one only need to push, and make it happen.
>>
>> Use standard system administration tools, like top, iostat, netstat, and
>> others, to analyze and profile your server. Once you are confident that
>> you know exactly where the bottleneck is, only then you can plan what
>> needs to be done.
>>
>
> Sorry for replying to wrong message in the thread - missed the original one.
>
>  From what i remember running courier-imap / maildir / webmail, 2 things
> are usually improve performance if slowing down starts with single-digit
> users:
> 1. imap-proxy
> 2. filesystem of NFS server that can do fast listing of directories
> containing thousands of files (we used NetApp filers).
>
> Just my experience though - a lot changed since i'm sure.


I should have mentioned that I'm already using imap-proxy.  I'm not
sure what you mean with #2.  You're saying I should incorporate an NFS
server on another machine with an optimized filesystem?

- Grant

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