The three virtues of a programmer: Laziness, Impatience, and Hubris. – Larry Wall

From Unreal Wiki, The Unreal Engine Documentation Site

This window holds the options for rebuilding a map

The process itself is described in Build

[edit] The Stats Tab

This shows:

[edit] Geometry

• Total brushes in the map
• Total zones in the map

[edit] BSP

• Total polycount
• Total node count
• The ratio of the above two numbers

Max Depth, Avg depth: no idea

A map made ofa single cube gives these two as 5 and 6. How the Average can be higher than the maximum of somewhat baffling.

[edit] Lighting

Again, the single cube map gives: 6(0). Adding a light makes this 7(1). Adding a ton of cubes seems to make no difference. Weird.