[Ulduar 10/25 - Thorim Arena Adds Spawn Rate]

[Argali]

The adds start off a bit slow but seem to come faster over time. Do they keep spawning faster and faster, or does it reach a certain spawn rate then remain there?

[Chicken]

Their spawn rate always seemed fairly consistent to me, each add type is just on a different spawn timer, which means that there'll be times when all of them spawn at once. It's kind of like the add spawns on the living side at the Gothik the Harvester encounter.