Have you tried opening the databases using a local copy of FileMaker Pro 14 on the server to see whether the it also experiences the delays? I'm assuming this is running on a LAN?
Also, was FileMaker 13 running on a non-Windows 2012 server? All our cloud servers are Windows 2012 running FileMaker Server 14 and they run fine, so it is likely to be a setup issue. Check all the Firewall ports are open that are needed Ports used by FileMaker Server 14 | FileMaker
Ensure any anti-virus is set to ignore any FileMaker file or folder.
Similar problem into Terminal Service on Windows Server 2012 with FileMaker Server & Pro 14 and Standby Server configured.
Clients seems to freeze after few minutes of inactivity.
On the client (no standby, sleep mode configured).
In TS sessions keep-alive every 10 minutes.
Servers are in farm and connectivity is perfect (same client side).
Very strange behavior.
Solution (no solution) = logout and re-login.
now we have tried with opening without server. We have the same problem. Now we found a problem witch is very strange. We have installed on win 8.1 Client FM13.09 and opened directly the database. I must say, we have much clients in Germany, with the same databases and Serversolutions and it runs perfectly fast without freezers. I think nobody has 8.1
On FM13.09 its the same problem. Maybe WIN 8.1 Pro is the Problem ? but on win 2012 R2 it`s the same. We deactivated all plugins, the same. ONLY WHEN WE CHANGE THE LAYOUT, without scripts its freezing !! WHY ????????