IMO, the most important STAT commands are:
STAT FPS (duh)
STAT D3D9RHI (draw calls and polys)
From these two you can make your best assesment of performance.
Though now I'm going to have to try out STAT UNIT...
FPS (frame) is a total evalution of the GPU versus content rendered, doesn't tell you why, just how much.
DRAW, I believe is draw calls. This says how many objects (meshes, textures (materials) are pulling resources from your GPU. In D3D9RHI, it also lets you know the polycount, as it requires computational power (cores x clock speed) to render/light the individual faces.
Your GPU's RAM comes into play when the number of textures/materials in a scene get large. More that need to be rendered, more get loaded into your GPU's RAM.
Hourences breaks it down nicely:
[URL]http://www.hourences.com/tutorials-ue3-performance-profiling-introduction/[/URL]
For a complete breakdown, visit the UDN site:
[URL]http://udn.epicgames.com/Three/StatsDescriptions.html[/URL]
