Everywhere. Every instance with mobs has very quick respawns. You can’t even kite a tough boss around as a ranged character like the old days. I was trying to fight one earlier and as I started to back away I ran into mobs in a part of the instance I had just cleared through merely seconds before. I don’t even think it’s time based. It’s more proximity based now. It’s the absolute worst form of mob respawning ever.