When I first installed HoW and went to the Burial Isle, the difference in the speed between monsters and party was very disturbing. So much so, I logged onto (either Black Isle's or Interplay's) web site, and read through their Q & A section. For the life of me, I cannot recall what settings they said to change in the config utility, but once done, it helped some. But those dang things sure are fast. Others on this forum should be able to assist more than me. And don't try to date any of the Wailing Virgins on the Isle either.
