Instant action mission "Normandy-Close Air Support" causes dramatic frame rate drop

[LeCuvier]

I have run this mission several times and the same happens every time: When a fair number of objects have been killed, the frame rate drops dramatically. It gets as low low as 5 and eventually the game freezes. Usually the behaviour gets erratic when the frame rate drops. Typically, the auto turn to target malfunctions, making the chopper turn away from the target, and stabilization gets erratic.

I have not seen this behaviour on other missionswith the Black Shark or any other aircraft.

[Elidji]

I've got the exact same problem with this mission.

[Boogdud]

Same thing for me, I'm on a Ryzen 5900x and get 120+ framerates in everything else, but after a few minutes it drops down to 4-7fps.  There's definitely something bugged with this mission.