Home » Kerio User Forums » Kerio Connect » Connect Client Performance (tune it?)

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We have run KMS and now Connect for many years under the same server. Using versions up to 7 with webmail, performance has been fine. After upgrading to 8, and 8.1, using Client, performance has been slow for many of our users. Most have reported problems using IE 8 / 9 / 10. We have switched them to Chrome, but some are still reporting slowness when opening messages, messages displaying as read, and general sluggishness.

Our server runs 3x300GB SAS drives in RAID 5, 10k rpm for the mail store, and has done for years. We have around 160 users, though these are not all concurrent. The server is running Server 2003 with 4GB RAM (32 bit).

- Is the sluggishness down to the BROWSER - we advise to use Chrome, but some staff can't tell the difference between IE and Chrome and pick the wrong one
- Is serving out the Connect Client interface heavier on the server? Are we going to have to go 64 bit and up the RAM?
- Is there a way to performance tune Kerio Connect?

I'm all for upgrading the server, however we have not budgeted for this so I would like to know if there is anything I can do before shelling out for new hardware, or causing downtime moving to 2008R2 with more RAM, for example.

Any advice welcome Smile

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I believe disk speed/RAID type is the killer here.

Our server was not built for Kerio (it ended up installed on a retired one) so while it's not shabby it's probably overkill in some parts and not optimal in others - Windows 2008 (64 bit) 16GB RAM. We originally had the same disk set up as you but added an extra drive then converted from a RAID5 array to RAID10. This gave us a little performance boost for next to no investment, you could give that a try. Depending on how cheap you can get new disks (and if your controller can handle it) you could swap out the 10k for 15k in RAID10.

The bigger boost for us came from the upgrade from V7.x to V8 - BUT ONLY for Outlook users.
A few of us use web mail and the new interface is woefully slow compared to the old version and I currently encourage users to keep using the old version for speed.

While we have a 64 bit OS we're reluctant to use the 64 bit Kerio software as it is only officially supported on the R2 version, so I don't know if the 64 bit version of KC would be improved by the extra memory available to it. I'd be interested to hear if it would as I would then have a good reason to replace the Kerio server hardware albeit next year!

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Performance problem of Kerio has always been the "Hard disk" device. When going to the new Client, they added an additional problem because New Client is slower that old one (an aldo lacks several tools). Kerio should stop to see only in the "contribution" side of the product and research a little more in the core of it.

No matter the KC increased a lot the price, they discontinued the support for some external antivirus, they never improved the SMTP features, antispam filtering and detection is too simple and they never reviewed how the storage is being done in the Hard disks. An ever growing message system should have an indexed database storage rform essages, and the "chain" of messages hsould be kept by indexing and not by acumulation of text in the message.
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