Great patch for my part!
Also disabling Aero (
http://forum.1cpublishing.eu/showthread.php?t=20842) and running Gamebooster might also have helped.
I am now playing with shadows, clouds, trees and buildings low, 1680res, grass on, roads on - rest on medium.
Its looking good, and performing very well.
Quick notice: buildings (over London) seems to be loaded at a short distance, so they keep popping up everywhere around you. Once loaded though, they stay there "a long time". Trees are drawn much farther away.
This is on Building Amount=low.
Setting Building Amount=unlimited the popping-up disappears...instead building blocks/squares/areas seems to be loaded in chunks.
Loading times also lowered here.