I am still on 1.8CE. Server has been very solid for most part, but now have 1 user that has very slow service once logged in. I used an ordinary account set up, and no other users are experiencing such slow access. The only factor that is different is that user has been using Outlook 2013 with caldav/cardav/groupdav connector.
The worst module is calendar, but all other slow to load as well.
I am increasingly under pressure to move to Microsoft server (AD/Exchange/Sharepoint) because “It just works, and anyone can use Microsoft”
Would rather hold the course with eGroupware for a few more years, but this problem is just on top of the issues that Microsoft broke webdav, but the EGW server is being blamed for the file sharing problems.