Delayed mail delivery after Rollup 6 install

After updating Exchange 2010 Sp3 to rollup 6, users are reporting that emails delivery is very slow and takes several hours to appear in Outlook. Mail delivery in OWA is instant.
The problem is fixed by disabling the Exchange cached mode option in Outlook but is not the best solution for laptop users.
Is this a known issue with rollup 6 or any patches available to fix this?
thanks.

Disabling the cache mode means it's not using a OST instead it's online with exchange all the time, if the behavior is only seen when in cached mode then it's having difficulty synchronizing the OST, if you have users with large mailboxes this could be causing
slowness.
Creating a new profile or removing and alternative to a new profile the ost and letting it recreate may solve for now, if you have outlook 2013 you can turn on cached mode but only cache 1 month of data this may be a solution for large mailboxes.
It is possible you have tipped the scales with the rollup install and are taxing the server just a little to much, is it a VM can you add Memory and see if there is some relief.
You can also try to run the exchange best practice to see if something else is going on.

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