Benchmark scores: link
Comparison screens between max/min detail, aa on/off, tesselation: link
DX10 very high in action on youtube: link
Config files are here, but people haven't explored it much yet:
global illumination can be enabled:
One's in steam/userdata/somenumber/43110/remote and the other is (username)/appdata/local/4agames/metro.
Originally Posted by Beyond3d
I haven't done much tweaking but I've managed to enable GI (it's kind of obvious but look for r_gi and set it to 1). It's off by default even though there's already some GI effects (like in a small room with the flashlight, for example).
Here's the GI settings by default:
Using just those settings there's some nice light bouncing effects with various performance inpacts depending on the scene and light number (in small scenes I really haven't had much drop at all). Haven't tested large scenes yet, like for instance, in the metro's where there's a ton of lights. I tried upping the settings to see if it actually had any effect or just my imagination and the scene slowed to a crawl (i set quality to .9). I'm sure it could be tweaked further for better quality/performance.