Greetings who likes pvp,
After having lots of try with game datafiles, I have found a way to minimize the lag problem of the Cyrodil ever!
First you should close the ESO for being these configuration succesful realy and;
Just need to go C:\Users\xxxx\Documents\Elder Scrolls Online\liveeu\UserSettings .
Than open it as ".txt", scroll down to bottom and you will see the parts starting with these numbers;
SET MaxNetworkWriteBuffer "104... "
SET MaxNetworkReadBuffer "104... "
You will need to change them as like below;
SET MaxNetworkWriteBuffer "10000000"
SET MaxNetworkReadBuffer "10000000"
Then save it as normal.
Note : If you dont want to change your settings by yourselves or by mistake just> right click>properties> tick to read-only and apply. You can change it when you want.
Note2 : When you joined the server you will see your lag increased realy much as numbers. But Just ignore it and go Cyrodil, enter a battle between 2 zerg grups then you can understand me well.
And it is done completely. Thats all, dear Tamriel Fighters. Your (additional) cyrodil lag dismissed!
As I said at the topic it is ESO support confirmed and this is my evidence.http://hizliresim.com/28EpBd
So FIGHT well or DIE well and have FUN at all