Heroic raid 18th Dec, all 33 members of raid reported huge fps drops to single digits when cyclone initiates and last perhaps 2 seconds, before recovering back to normal values (although this fight seems stressful on systems, a ryzen7 5800x / 3080ti / 32gb ram is getting 40fps @ raid gfx level 5).
I don’t think we observed this in normal (14th Dec).
Makes the fight almost unplayable.