After doing more testing today, I determined that the source of the lag was my router. Apparently it was in a bad state and nothing but a hard reboot would cure it.


Anyway, I tried the RAM disk again with the above MPQ files on it. I saw significant improvements in overall game play. Everything was just smoother, especially in large 40-man battlegrounds.


One big improvement that I noticed is that "Interact With Target Circle-Jerk". With 5-boxing, my melee teams were always right on top of the target doing the circle of death.
With 10-boxing, my toons would do large circle-jerks around the target, which I attributed to CPU limitations.
With the RAM Disk, they circle the target much tighter than before. I'm not sure why this is the case. I assume that since the RAM Disk is too faster, the CPU has more time to do other times.