That't awesome! I see >20% fps increase in the benchmark with AA and PhysX on!
Great!
Everyone with stuttering problems (I think is something that affects everyone to a greater or lesser degree), if you want to play with smooth aframerate, the only way at this moment is
-buy the game
-install it with steam
-close steam
-copy your game folder to another location
-use the no-cd exe (version 1.2) and dll in your new location (I can't provide links for this, use google)
-start the game in the new location
-enter options menu: set your graphical config, activate VSYNC ingame
-close the game
-go to %appdata% local/4a games/metro LL/
-locate both user.cfg (the one from steam version and the one for new exe) and change those lines:
sso_connect_tries 1
sso_first_time 0
sso_receive_updates 0
sso_receive_updates_thq 0
-start the game from new location and enjoy