[imp] New IMAP server, troubleshooting slow IMP performance

[Jan Schneider]

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?

-- 
Jan Schneider
The Horde Project
https://www.horde.org/