Maacodale makes some good points. The Dragon will reward paying close attention to the correct line. Like most roads, and race tracks, a late apex is generally the fastest way around. A lot of people describe that as slow in fast out. Think in terms of where you want the car pointed when you are on the inside of the corner or apex. With the car pointed toward the corner exit as opposed to requiring more turning of the wheel, you will be able to get on the gas sooner. You might be surprised how late and sharp you have to turn to do it. The other aspect of a late apex is it is a lot safer. Remember the slow in part. If you use your brakes as hard as would be required to really go as fast as possible on the Dragon they will likely overheat. The Dragon is much harder on brakes than any race track I can think of. There isn’t any time to cool then down. To address the question about braking or engine braking there is no simple answer. Think about it from how tires develop traction. A tire will develop more traction the more weight it has on it. When you brake, turn, or accelerate weight or load moves off some tires onto others. The wrench in the works is that while the amount of grip or traction a tire will develop goes up the more weight it has on it, the increase in grip is not proportional to the amount of weight being transferred, so the affect is increasing grip to a point, but once the centrifugal force pushing the car to the outside of the turn reaches a point you have less traction or grip. Race drivers have to know how to do a number of things well, but optimizing grip is one of the most important. Have I fully confused everyone?
I like to drive the Dragon quickly without using much brake. I concentrate on the correct line. The corners on the Dragon flow together and I find that you can develop a rhythm to your driving, much like you would on a race track if you are going fast and really have your head into it.