Reproducible: FPS drops from 50fps to 8fps in a few seconds after taking off if ARRIVAL airport is set in pre-flight screen AND fly over British Columbia Canada

OK, after read hundreds of threads and replies, I have more findings:

I tested a few more cases tonight. And the following scenarios happened:

  • No matter what airport the aircraft is located, this issue ONLY happens when ARRIVAL airport is pre-defined in pre-flight screen.
  • When fps drops, I can fix it IMMEDIATELY right after clearing the destination in flight assistant.
  • If I set the destination again, issue never appears again in the same flight.