At first we didn't even have a level selector. You pressed "P" to visit the "Testing Level", which eventually was named Fly Zone. Stout made some Lego-like(legally distinct) textures.
The controls were really unresponsive at first, but some big improvements were made. Most importantly, when your torque meter was halfway it would increase much faster so that you could start flying much sooner.
We had a problem with Moose City lagging really badly, so I added Visibility settings on the 1-5 keys which set the max render distance. Eventually we figured out that it was the map importer creating 331 dynamic lights. After creating a component to remove these, instantly we had good performance at max render distance.