[Lordaeron] Hing ping

Well, as the title says, I have high ping ONLY in the Lordaeron server, and ONLY in afternoon. (when the server is full 10k players)

First I have to say is, I play conected by ethernet cable, No more ppl in my house, no ppl in my lan etc etc. My ISP works OK.
I play another games like, league of legends, heroes of the storm, smite, Left4dead etc... And I never experienced lag or high ping before until now.

I played in warmane servers since 3 or 4 years ago, and I've never had lag. Even if i play nowadays in for example MOP server.

I only have lag in Lordaeron Realm. When 10k players.

My question is, do you experience something similar?

Is there some way to fix this? Port forwarding?

I followed this guide: http://forum.warmane.com/showthread....any-game-by-50

It didnt work. Help please. It's annoying to play 150ms to 300ms unstable...