I tried it - it loads as fast with 100k or 150k, cockpit display did not do much either - it gets a bit smoother with less eye candy .

I am no expert but it seems like a lot of stuff keeps loading after the flight starts, it loads very quickly ( I haven't timed it but less than 30s ) the Spitfire is ready to fly and it is still loading and loading and loading, so when I try to move it starts to stutter.

When I run P3Dv4 first time, it takes forever for the flight to load, several minutes - but then it is silk smooth and when I load any scenery afterwards, it is all cached and it loads fast.