Ghallanda
Age of Rage Chain - full group R7-R10. No lag in first 2 quests.
Madness of Crowds R10 lagged really badly after we found Brawnpits and 7 or 8 reapers spawned. At the same time, other people in the guild were complaining of lag too.
Age of Rage R8 endfight lagged just before the Beholder spawned and continued to the end of the quest.
Also, regarding Orchard explorer area - guildies have told me that they have had no lag in there later on in the day after I did it so it doesn't seem to be related to the dungeon or instance. I had no lag in A Study in Sable but have heard others complaining. Not sure what to make of all of this.
It's almost time for raids - I'll let you know how they go.