- Monsters summoning. Not monsters with the Summoner class talents, but the older monsters with the older summoning talents, like honey trees and ghouls. Each time they summon there is a pause (whole game freezes) for a few seconds
- Bosses dying and dropping artifacts. I *think* it's the artifact, not the boss, which is the critical issue here: you can see the message log (and the whole game) pause before each gray item
- Simply walking over an artifact that was randomly generated in the dungeon
I'm using the OSX port.