In chapter 1 my party is at the end of the goblin warrens 1. When they
enter the warrens 2 there is a battle as soon as you enter the level. The
game has played fine up to this point, but everytime I get to this level for
this battle, the battle is really slow and the rest of the game thereafter.
Each time I've reloaded and done the battle again the same thing happened.
Is this a glitch in the game that goes away once I get out of that level, or
is there something else that's wrong with my computer. What does it sound
like to you?

Thanks

Yes, there is a 3rd party fix made for it available for d/l in here at Sorcs

http://www.sorcerers.net/Games/IWD2/IWD2_Slowdown_Fix.zip

Hey thanks A LOT!!! It works great now.