Helicopter FPS Drastically drop when switching mission task

Do you have the same issue if you follow the OP’s steps to reproduce it?
• Yes

Provide extra information to complete the original description of the issue:

  • Sightseeing mission on helicopter;
  • all went well, except when arrived at the last phase (hover the drop zone), where my sim suddenly drop FPS; the heli becomes unflyable
  • I had to smash the heli down (by cutting power) to land; FPSes went back to smooth then
  • Mission : “Helo Flightseeing @biosphere” (Montreal, CYHU)
  • Not other issue in my sim (no such FPS drops on major airport, and other bugs)

If relevant, provide additional screenshots/video:
• None