On 03 Feb 2014, at 14:58, List <list@airstreamcomm.net> wrote:

> On 1/27/14, 5:01 PM, Stan Hoeppner wrote:
>> On 1/27/2014 1:06 PM, List wrote:
>>> We are hosting a webmail service using roundcube 0.8.1 and a number of
>>> our users with inboxes in excess of 8000-10000 messages are experiencing
>> "Inbox" folder has 8-10K, or the entire mailbox including subfolders has
>> 8-10K messages?
>>
>>> extremely slow response times (We also downloaded a recent copy and it's
>>> just as slow).  We are using Dovecot 2.1 as the IMAP server and have not
>>> had any issues with clients like outlook or Thunderbird, but as far as
>>> we understand it those clients keep a local copy of the messages for
>>> quick retrieval while Roundcube is doing everything over IMAP.  Is there
>>> any thing we can do or should look at to improve the response times for
>>> loading an inbox with many thousands of messages?
>> What do you mean "loading" an inbox?  Are you referring to
>> initialization just after logon, where new message notifications get
>> displayed on the folder tree?  Or do you mean simply clicking on the
>> "Inbox" folder?
>
> The slowness appears when users click on their inbox.  It does not matter if they are logging in or have had their email open for a period of time already, every time they click the inbox it throws an error that the server could not be reached, and eventually the messages appear.
>
>> How many rows per page are these users displaying?  This is user
>> configurable.  If the value is high things will be slower.
>>
>
> Our default is 50 messages.

Like I said before, check what sort method these users have, and what your imap server does on that sort method. For instance, sorting on arrival date is usually very fast because the server doesnt have to do any sorting, but sorting on sent date can be very slow if your imap server doesnt keep an index of headers. If your server needs to sort all 8000+ messages on every click, you're going to have performance issues.

Cor

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