Server-Client communication problem - stuck at authenticating

Hello guys,

i've got a huge problem. From second to second, my server started to lag (latency more than 12k). Clients recieves this latency from "Authenticating" message when he tries to log in. I used old core, so i've updated it, but it did not help. Problems are on two different VMs which have only same db. Does someone know how to resolve this problem, or at least, where to look up on it? Thank you for your time and answers. Both auth and world server works in console fine.

TC before update:TrinityCore rev. 905685516092+ 2016-07-23 15:46:33 +0200 (3.3.5 branch) (Unix, Release, Static) with TDB 335.60
TC now: latest

EDIT:Moved Auth DB to other server, but problem presists

There is an update coming which is going to do a complete change on the structure of authserver dealing with authentication and the way the client communicates with the server and using a stronger socket for connection, which is also going to change the way latency is handled in a better way after the updates have been done.