See my above post about Umbra. And I'll take that medal (my frame rate is above 20, just about, it is a laptop after all). Not sure how the open option Better Cities works, but I'm fairly sure it's still in a separate worldspace. Will have to ask/look into it though. And no, they couldn't have done it without proper culling, it would have killed everything. The only reason I manage to get by is because of OSR and a bunch of other .ini edits

. Opening the cities isn't that much extra stress though, because the only thing that isn't loaded in the closed cities is the stuff around you, which usually isn't high poly (trees and the like).
Most
desktops don't get 20FPS with Better Cities. I'm guessing we're really not talking about the same Better Cities (not the old one). Either that or you run at 800x600 with all the settings on Low, and this is not at all what I'm talking about in terms of stress. You'd have to at least be running at Xbox 360-equivalent settings (Medium-High) And, still, you won't be getting any medal, because it's absolutely impossible that VANILLA Oblivion runs the same for you as MODDED Oblivion does, especially Better Cities. And I'm not talking about one circumstance where your framerate is above 20. I'm talking about looking right at the center of the city from one of its edges, and comparing the two.
For me, vanilla cities could easily be capped at a constant 60FPS. Better Cities? Probably an average of 20FPS. I haven't installed it on this specific computer yet, but Better Cities gave me 20FPS on average in the IC Market, on a desktop with a GTX 280. On High-Very High settings. Bravil was just about as bad.