Post on the tech support forums is better then calling that way people have more time to get your question to the right person.

Well to render your screen your computer has to only know where you are and where others around you are. Clearly if the server does not update this information before its time to render the next screen you local computer just assumes that you, npc's and other players are moveing in the same direction they were are the last infromation send from the server. Thus even when you have no connection to the server you will still have a screen rendered ... its not like your screen goes blank, your computer just uses the lastest data from the server that it has.

Thus high latency will not give you texture lag, they are two completly independant things. If you have texture lag then you need to upgrade yur hardware.

If you have latency lag, outside of moving closer to your data center, you might pay for a higher internet connection or there are those network cards but I doubt if you get 10percent better with that. I think routers with QoS might help, but if you are running nothing else at the same time well then you will have top priority anyways.