[Dovecot] Outlook 2010 very slow when using IMAP - are there any tweaks?

Kaya Saman kayasaman at gmail.com
Tue Jul 3 10:12:18 EEST 2012

On Tue, Jul 3, 2012 at 7:59 AM, J E Lyon
<role.Dovecot-Readers at jlassocs.com> wrote:
> On 3 Jul 2012, at 07:46, Timo Sirainen wrote:
>> On 3.7.2012, at 9.38, Kaya Saman wrote:
>>> So if I look at a different authentication mechanism say LDAP would it
>>> improve performance?
>> I doubt authentication has anything to do with why Outlook downloads mails slowly.
>> But you could configure Outlook to use plaintext authentication instead of NTLM authentication to see if it makes a difference. No need to change anything on Dovecot side then.
> It's a bit of a random tuppenyworth, but all my experience of slow Outlook clients seems to be local mail store sync work, perhaps garbage-collecting / defragmenting or something, but not actually getting the emails themselves . .
> I have one particular client who reported issues yesterday as it happens -- all versions of Windows from XP thru Win7 running mostly older Outlook but a couple of 2010 clients -- and one particular user, logged in on only one particular workstation (Win7 & 2010 as it happens) experiences _colossal_ delays in waiting for mail to open or respond at times, and yet any other user, or moving to another machine, it's all swift and fine.
> That smacks of a local desktop cache problem to me... All on the LAN, as well, no slow connections.
> As I say, just 0.02 -- may not be overly relevant, but my instinct is that local storage with Outlook has significant possibility for issues.
> J.

Hmm... interesting point and had I been using a 'standard' filesystem
type I would have to agree.

However this is a clean server with plenty of space left on the pool
allocated for mail and it's additionally using ZFS too.

The point is that I am monitoring using nload as well as other things
and the maximum bandwidth being got with Outlook is a few Mbps burst,
average 50kbps; while with T-Bird I get way over 130Mbps???



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