Apex Valaakar spawns are out of control.
The spawns alone are ridiculous, but with the frame rate drop on-top of it, it makes this mission no longer 'fun' in any way shape or form.
The irradiated Kopion spawn is SO bad, that 5+ will just randomly spawn around you, especially in the field. Which quickly can spawn more creating a swarm of 15+ out of nowhere. Atleast 3 bites knock you, then the radiation from the area and Kopions standing on your body means you're really already dead.
The worms.... well you see a small part of what our group ran into. The entire area was like this, including worms spawning on the walk-ways and stairs, and INSIDE the building.
Also, the spawns DO NOT STOP after you seemingly are getting close to having everything killed off. When this mission first came out, you could get everything mostly killed off then only have the occasional small worm spawn, and be able to focus on collecting the Valaakar parts you fought so hard for.
I understand making a 'raid' challenging, but this is not that. The enemy spam, and buggy-ness of the game makes it a near impossible mission not due to skill level alone.