Does anyone know if there is a way to disable the AI keeper taunts or delete the audio files? Not only do they get aggravating after a while, but in the realms with two keepers the frequent taunts seem to actually slow the game down.

I doubt it slows your game down, but you can use 'dksound' from the dktools to modify the sound and speech files of dungeon keeper. Here's a list of the voice messages.

I used that method to disable most of the mentor messages. Peace and quiet is good.

I kept the keeper taunts because they have significance. The AI uses them when they are attempting to initiate an attack. Usually you will see a call to arms beacon or enemy bridges popping up.