Discussion about mapmaking in Heroes V.

Guys, I found an amazing feature in the editor. I've almost finished the map (it seems to be turning out well), but here's the catch: The game runs without any glitches, but only on the lowest settings, and I designed the map for maximum graphics. After completing half of the map, I decided to test it, and guess what? The graphics are set to maximum, and it runs perfectly, even in a battle with 2,000 titans, without a single extra glitch. How is that possible?