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Home » GFI User Forums » Kerio Connect » Extremely slow Outlook
Extremely slow Outlook [message #147706] Sun, 08 March 2020 16:48 Go to next message
softmaster is currently offline  softmaster
Messages: 6
Registered: March 2020
We moved from Exchange 2007 to Kerio 9.2.11 and I have to note that Outlook with KOF works very bad.
My mailbox size is about 30GB
I tried to setup Outlook 2019 - but it was freeze all the time during practically any operation, practically any search just killed the Outlook.
I tested 2016 and 2013 with same results.
Only Outlook 2010 works little better, but still much slower than 2010 with Exchange 2007 on the same mailbox.
The search still much slower that is was before. Outlook periodically freeze during send/receive process. I had have to empty cache twice till mailbox synchronized successfully. Unsuccessful sync means that KOF shows that all is OK and it idle, but Outlook shows messages for the last month, and from 2016 or 2017, without messages between these dates.
BTW - search on Web interface works acceptable.
So my question is the next. What is the best practice of Outlook usage with Kerio? How to manage it to work properly with Outlook 2019 and big mailbox (about 50GB that шы very normal now).
Is it possible to limit quantity of messages downloaded locally (I mean not attachments but whole messages, limit by date etc)
Is it possible to have instant search like in Exchange (instant search with chars typing, not by whole word after Enter)
Thanks

Re: Extremely slow Outlook [message #147708 is a reply to message #147706] Mon, 09 March 2020 09:20 Go to previous messageGo to next message
ian.bugeja is currently offline  ian.bugeja
Messages: 666
Registered: March 2017
Location: Malta
Hi

What bitness of Outlook are you trying out? Is it x86 or x64? We strongly suggest using x64.

Regarding limiting the mailbox size, what is the number of days set in the Synchronization settings?

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Regards
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Ian Bugeja
GFI Software
Re: Extremely slow Outlook [message #147709 is a reply to message #147708] Mon, 09 March 2020 10:54 Go to previous messageGo to next message
softmaster is currently offline  softmaster
Messages: 6
Registered: March 2020
Hi
Thanks for quick response.
All tests I performed for Outlook 64 bit.
Number of days for attachment sync was 180, as by default. Changed it even to 30 days during my tests - it didn't help.
Actually I would like to receive some recommendation and best practice for setup of Outlook 2016-2019 64 bit with Kerio for normal usage with mailbox 20-50GB, that is practically standard size today. Till now I perform lot of tests and found it practically useless. Web interface works properly, but Outlook is most popular mail client and have to work properly with Kerio.
Re: Extremely slow Outlook [message #147714 is a reply to message #147706] Mon, 09 March 2020 15:55 Go to previous messageGo to next message
McIrish is currently offline  McIrish
Messages: 256
Registered: October 2011
What type of hard drive do you use on the local machine? I find we have to use SSD drives or Outlook runs super slow. Also, make sure any antivirus software is not constantly scanning the mail data folder. That will slow it down a lot. 30GB is a pretty huge mailbox. Make sure the bulk of the mail is NOT in the inbox. That would slow it down badly. Create folders outside of the inbox to store email that you want to keep but have already read. Move the email via web mail (not Outlook).
1) Use an SSD
2) Reduce the amount of mail in the Inbox
3) Prevent antivirus from scanning the cached mail data
Re: Extremely slow Outlook [message #147732 is a reply to message #147714] Wed, 11 March 2020 21:34 Go to previous messageGo to next message
softmaster is currently offline  softmaster
Messages: 6
Registered: March 2020
Hi
The computer is i7 32GB with 2 x Samsung NVME in RAID0. Outlook is 64 bit. Antivirus is not scanning cache folder + I switched it off during tests for sure. But search still works slow, freeze Outlook etc.
Regarding amount of mails in the Inbox. For sure it will work quick with 100 messages. But I have about 72000 mails in Inbox, this quantity is normal for today and it worked properly with Exchange. So, I expecting for same with Kerio.
Any ideas and/or recommendations how to manage normal Outlook's work with Kerio? Right now it practically useless 8-(
Re: Extremely slow Outlook [message #147734 is a reply to message #147732] Thu, 12 March 2020 11:57 Go to previous messageGo to next message
ian.bugeja is currently offline  ian.bugeja
Messages: 666
Registered: March 2017
Location: Malta
What is your system locale?

Also, do you have an open GFI support case? Can have somebody from the team look deeper in the logs.


Ian Bugeja
GFI Software
Re: Extremely slow Outlook [message #147741 is a reply to message #147732] Fri, 13 March 2020 15:26 Go to previous messageGo to next message
freakinvibe is currently offline  freakinvibe
Messages: 593
Registered: April 2004
softmaster wrote on Wed, 11 March 2020 21:34
Hi
The computer is i7 32GB with 2 x Samsung NVME in RAID0. Outlook is 64 bit. Antivirus is not scanning cache folder + I switched it off during tests for sure. But search still works slow, freeze Outlook etc.
Regarding amount of mails in the Inbox. For sure it will work quick with 100 messages. But I have about 72000 mails in Inbox, this quantity is normal for today and it worked properly with Exchange. So, I expecting for same with Kerio.
Any ideas and/or recommendations how to manage normal Outlook's work with Kerio? Right now it practically useless 8-(
30 GB Mailbox with 72000 Emails in the Inbox does not work very well. We have have set a maximum of 5 GB mailbox size per user and recommend not to have more than 5000 emails per folder. That works quick and well for our users.

Email is not a document repository. You should archive mails away you do not use on a daily basis. Also, Kerio is not Exchange. Kerio is using the file system for mails, Exchange is using a database.


Dexion Services AG - IT Support Services in Basel, Switzerland
https://dexionag.ch
Re: Extremely slow Outlook [message #148016 is a reply to message #147741] Sun, 26 April 2020 21:25 Go to previous messageGo to next message
softmaster is currently offline  softmaster
Messages: 6
Registered: March 2020
Hi
I have to note that web interface with the same file system, same quantity of messages etc works perfect (search etc). So, the problem not on server level (I mean that despite Kerio is not Exchange, the search on server works quick enough), the problem is on the Kerio Outlook Connector level..
Please provide some recommendations - how to manage the normal Outlook usage. Because now it practically unusable - each time when I need to find some message I am opening the web interface.
And I can't delete messages from mail store - I need them for my everyday job, many times per day I am searching old messages by sender or by some keyword..

Thanks
Re: Extremely slow Outlook [message #148019 is a reply to message #148016] Mon, 27 April 2020 16:16 Go to previous messageGo to next message
McIrish is currently offline  McIrish
Messages: 256
Registered: October 2011
Webmail will always be fast. It has no cache to load. It's just grabbing screen info from the server but does not have the files locally. Outlook downloads ALL email and has to keep them in sync with the server. In Outlook, create other folder, not inside the Inbox. Move older email into those folders. You want to get the bulk of email out of the inbox. They can stay on the server, just have other folders for them to live in. The Inbox stays in constant sync, so it puts a lot of demands on the server and the network, especially with that much email.

I would create folders and do the moves in webmail, not Outlook. It's more direct and will work fine. I think that should speed up you mail. It has for my 450 users.
Re: Extremely slow Outlook [message #148055 is a reply to message #148019] Sun, 03 May 2020 13:58 Go to previous messageGo to next message
thegaijin is currently offline  thegaijin
Messages: 36
Registered: September 2018
Using 64bit Outlook is better in the latest versions.Still not even close to be considered decent.Plus you get another problem if you use 64bit Outlook.Preview in explorer is problematic in windows 10 if you use 64bit Outlook.Still waiting from GFI to do something if they wanna keep calling this product ''Exchange Replacement''
Re: Extremely slow Outlook [message #148079 is a reply to message #147706] Thu, 07 May 2020 11:28 Go to previous messageGo to next message
AndreasL is currently offline  AndreasL
Messages: 126
Registered: July 2008
Location: Germany
I see perfomance problems with newer Windows/Outlook version while handling calender and contacts in KOFF.
We have some older Windows terminal servers running 2008R2 and Outlook 2010. In this setting KOFF ist fast to do an initial sync an a fresh useer session.
If we setup the same user on a Windows 2019 RDS server with Outlook 2019 the same process takes a very long time to sync calender and contacts. It takes up to one second per contact. We have several contact folders to sync and some hold more then 1000 contacts.
The local DB is set to 30 days and will not be roamed. We use always the latest Kerio connect version. The servers running on SSD. No hardware bottleneck. We have to use 32bit Outlook. This is needed for external access from other programs over add-ons.

The calender sync seems to be a very special problem too. I try to reduce the content of the calender. How I do deal with old entrys in the calender? Some users have old entrys for more then 5 years and I cant find a right way to archive them. In Outlook I cant set the archivment function for a calender folder. But If I use the the cleanup funktion in Outlook and say 'handle all folders' theses Kerio calender entrys will moved to the archiv .pst. But this result in error messages for every moved entry and the user get a lot of them.

Regards
Andreasd

[Updated on: Thu, 07 May 2020 11:30]

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Re: Extremely slow Outlook [message #148252 is a reply to message #148079] Wed, 10 June 2020 13:19 Go to previous messageGo to next message
BionicWave is currently offline  BionicWave
Messages: 9
Registered: November 2015
I have a customer which was using Kerio in Version 8.2 for several years. this worked until they had to update the terminal-server, thus they had to update office, thus they had to update the KOFF connector, thus they had to update the Kerio-Server. They never had problems with the search-function ( some 10.000 mails in the "incoming" folder). But since the update to the latest Kerio there are problems over problems.
Conclusion: Only a few years back the search-function was working perfectly, but in between 8.2 and 9.x something happened and now i have a big problem with that customer.
Just for the record: Old server was on an old appliance with slow hdd. New server is on SSDs with much more and faster ram and crazy fast Xeon cpus. Server got 10x faster than before, but Outlook got 10x slower, or crashes, or shows nothing. What happened? I can not sell this product anymore, before this problem gets fixed. All our clients use a LOT of e-mails. They worked with the outlook search on an Exchange-Server backend for years. Now they barely get results from KOFF.

I´m realy disapointed.
help-browser.png  Re: Extremely slow Outlook [message #148275 is a reply to message #148252] Sun, 14 June 2020 22:10 Go to previous messageGo to next message
Piff14 is currently offline  Piff14
Messages: 57
Registered: July 2008
Location: Vienna
We have just installed KC 9.2.12 patch 1 (5027) and also see very poor performance of Outlook 365 (5 accounts on one PC, biggest ca. 11GB, others about 1GB). (Using delegation instead of multi-account setup is not wanted for 2 specific reasons, dont know if it would perform better when subscribed to the ssame folders. Any opinions?)

The server is SSD-only and WebMail is super-super-fast, but the PCs have HDDs, 6GB RAM, and Outlook is very slow with the default settings. (We still have to try the above-mentions things).

We heared that previously Outlook with Exchange 2010 was ok when local cache was turned off. Is there a way to disable KOFF's cache? It is probably quite useless in our scenario.

Using Outlook 32bit, as this used to be MS default and avoids running into compatibility issues with 3rd-party apps.
help-browser.png  Re: Extremely slow Outlook [message #148276 is a reply to message #148275] Sun, 14 June 2020 22:25 Go to previous messageGo to next message
Piff14 is currently offline  Piff14
Messages: 57
Registered: July 2008
Location: Vienna
There is one big folder tree (100.000 items / 11GB), currently residing in the inbox of one account, kind of an archive that most users need to access.
Would it improve or affect performance to move that into a public folder?

In other words - are there any experiences: Does it make a difference WHERE that big bunch is located?

  • Inbox of one account
  • Other folder of the account
  • In a public folder
Re: Extremely slow Outlook [message #148285 is a reply to message #148275] Mon, 15 June 2020 18:37 Go to previous messageGo to previous message
Bud Durland is currently offline  Bud Durland
Messages: 586
Registered: December 2013
Location: Plattsburgh, NY
Piff14 wrote on Sun, 14 June 2020 16:10
We heard that previously Outlook with Exchange 2010 was ok when local cache was turned off. Is there a way to disable KOFF's cache? It is probably quite useless in our scenario.
Kerio used to have an ON-line connector (KOC), which kept all the messages on the server, and was always faster than the off-line (KOFF), at the expense of having to always be connected to the network. KOC has been deprecated for several connect version now. You could connect OutLook to Kerio Connect via IMAP, and it will likely be quite fast accessing e-mail, but you would lose access to public calendars, address books, free/busy search, etc.

Regarding your other question, we've found that putting a limit of about 10,000 messages per folder does improve OutLook performance, though not by an order of magnitude.
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