I just picked EIDL, which is as far away, but I do not get that bug. It must be somewhat related to EDDF. Very strange…
What happens if you spawn at EDDF?
Same thing. First I get excellent FPS, I take off and I get stuck at around 15fps. So it is obviously not exclusive to Queenstown, but somehow FPL related.
EIDL did not give me this problem.
Maybe it’s the EDDF scenery that is bad.
You could try removing Asobo-airport-eddf-frankfurt and see if a rebuild of that helps.