EQ - Lag in Stillmoon Temple

[Kobe008]

I run 2 characters at once and am pretty much lag free except when I go to Stillmoon Temple. In that zone the first character to zone in is ok, but the 2nd is unplayable unless they are looking at a wall or looking straight down. I doubt it is a WinEQ2 problem but would like to know if anyone else experiences this and has a solution.