[imp] login slowness with large inboxes after upgrade from Horde 3.0.10+IMP 4.0.4 to Horde 3.3.8 + IMP 4.3.7

[jose manuel blanco]

Michael M Slusarz escribió:
> Quoting Jose Manuel Blanco <jmblanco at sciops.esa.int>:
>
>> Regarding the IMAP server side suggestions, the thing is that my old 
>> webmail (Horde 3.0.10+IMP 4.0.4) is connecting to the same IMAP 
>> server, and it has no problems dealing with large inboxes -1 or 2 
>> seconds max. for displaying inboxes with more than 40000 mails never 
>> been cached-, so my question remains: has the imp code changed in a 
>> way that would explain that behaviour? For example, when I click in 
>> the Date tab to reorder my messages, my old webmail only reorders the 
>> ones that are visible
>
> No.  As previously described - this can NEVER happen with IMAP.  IMAP 
> requires a full sort of ALL messages in the mailbox - not a mailbox 
> slice.
>
>> while the new one goes to the first (or last) page instead. This 
>> suggests that the old one is only dealing with the ones that are 
>> visible, but I can't be sure. The settings are the same in both 
>> webmails as far as I can see.
>
> What is probably happening is that somewhere between IMP 4.0 and IMP 
> 4.3 sorting got fixed.  So clicking on Date now correctly sorts by the 
> date in the headers of the message vs. the IMAP sequence number (which 
> is often a date sort, but not always).  Sorting by sequence numbers is 
> extremely fast because it is the only operation that doesn't require 
> sorting at all - you can just grab a message slice.  But sorting by 
> sequence numbers is also not very useful since messages may appear to 
> be in a random order.  That's the tradeoff.
>
> michael
>

Thanks for your answers, Michael.

Since I'm dealing with a community of hundreds of users with huge 
mailboxes, I'm afraid the new horde slowness is going to determine if we 
can go to the new one or stay in the old one. I'd like to try as a last 
option this "sorting by sequence numbers", just in case  it speeds up 
logins, but  I 'm not sure if that is an option in the imp 4.3, unless 
it's the "Arrival date" one (that I have already tried).
The other options I see are Message date, From, To, Subject, Size and 
Thread view.

Cheers
Jose Manuel

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