[imp] New IMAP server, troubleshooting slow IMP performance

[Simon B]

On 26 Jul 2017 11:36, "Jan Schneider" <jan at horde.org> wrote:
>
>
> Zitat von Simon Wilson <simon at simonandkate.net>:
>
>
>> ----- Message from Christian Schoepplein <c.schoepplein at musin.de>
---------
>>    Date: Wed, 26 Jul 2017 09:39:51 +0200
>>    From: Christian Schoepplein <c.schoepplein at musin.de>
>> Subject: Re: [imp] New IMAP server, troubleshooting slow IMP performance
>>      To: imp at lists.horde.org
>>
>>
>>> Hi Simon,
>>>
>>> On Wed, Jul 26, 2017 at 12:07:26PM +1000, Simon Wilson wrote:
>>>>
>>>> I've just moved over to a new IMAP server on my local network,
migrating IMAP
>>>> from a CentOS 5 to a CentOS 7 server in the process. Horde/apache are
on a
>>>> separate server on the same network as both the old and new IMAP
servers.
>>>>
>>>> I'm trying to troubleshoot laggy performance in Imp since the move.
>>>>
>>>> For example, refreshing the mail list in Inbox and deleting an email
each
>>>> take 3 to 4 seconds before the Refresh circle stops spinning and the
list is
>>>> updated. This is longer than it was before (1 to 2 seconds typically).
It
>>>> just means that overall Imp feels very slow.
>>>
>>>
>>> Just a few ideas:
>>>
>>> - Is your imap server respongding slow if you connect with another mail
>>>  client, for example Thunderbird?
>>
>>
>> No - feels very snappy from Mailbird.
>>
>>> - Are other php scripts on your webserver where imp is running also
>>>  reacting slow?
>>
>>
>> No. WordPress, which is hosted on the same server as Horde, is
performing as normal. I also have a custom PHP app running on that box, and
it's lightning fast. The Horde server is not highly loaded, CPU usage avg <
5%.
>>
>>> - Are the cache settings for horde and imp the same as they were in the
>>>  old setup?
>>
>>
>> I've not changed anything on the Horde server except pointing Imp and
Ingo backends.local.php to the new IMAP server address. I also rebooted it.
>>
>>> - Are the network settings, especialy routing and DNS, on the new
>>>  webserver really OK?
>>
>>
>> The web server has not changed at all, Horde and httpd are unchanged
(apart from the changed config to point to the new IMAP server), only IMAP
has moved. The server IMAP has moved to is running well - again very low
CPU, 4GB RAM. It runs postfix, cyrus-imapd, associated mail filters, and
nothing else. It's not a high traffic mail server.
>>
>> It's only Imp that appears sluggish when pointing at the new IMAP
server, yet the transactions appear to be fast from the IMAP IMP debug log.
Maybe I'm imagining it... but my seat of the pants dyno tells me it's
slower... :)
>
>
> Did you try emptying the IMAP cache, assuming you have it enabled?

Also, does your seat of the pants tell you it's slower with other
browsers/incognito session?

Simon