- If you compare your upgraded-to-850 full install against a quick download of the 840 demo, the comparison isn't fair; it turns out that having full scenery installed is slower than having just one tile.
- The very nice demo KSBD layout Austin G. made us hits frame-rate a bit, with all of the lights, painted lines, and curved pavement.
I am investigating ways to simplify complex airport layouts when settings are low. Regarding the fps loss when more scenery is installed, it turns out KSBD is relatively close to the edge of the DSF. So even though you can't see water in the next tile (when you have the demo) it turns out a little bit is being drawn; X-Plane doesn't know that the mountains hide this.
If you try this test while looking to the left (north into the center of the DSF) there is almost no difference between demo and full scenery.