Not sure, people complain about 421 performance but it has lights that are both pointlight/spotlight with shadows turned on, if you add people's ultra settings the number of verts skyrocket for no particular reason as there is barely any difference (some lights have some geometry to actually use the shadows ON but it feels like it ditch the performance heavily).
I've posted that thct1 screenshot the other day, we were just adding things as usual and suddenly we ended up with 12000K verts with just half of the RA room done. After removing godrays, turning shadows off of lamps, removing some meshes that could be created with brushes we managed to lower the verts count to around 2500K, basically more than doubling the fps. I've talked with shooter the other day and he promised that he would add an option to turn the sun off for maps that don't really make use of it as it further improves the performance (without the sun I'm around 1000K verts so that's like 10% of the initial geometry we had and less than half of what I have now without touching anything).
More on the topic I think there should be a 'default' demo on a well-optimised map that people could run with something like timedemo 1. It would be cool if the summary screen would give you detailed info about frames/gpu/cpu usage