Okay I think I may have found a fix for the stuttering, this worked for me and it may work for others if they come looking.
Nvidia Control Panel
(If you have SLI) SLI Mode - AFR 2
Threaded Optimization - OFF
Triple Buffering - OFF
Vertical Sync - On (Smooth for SLI)
Metro Last Light - Game Steeings
Advanced PhysX - OFF
Resolution - 1920X1080
Quality - Normal
SSAA - OFF
Texture Filtering - AF 4X
Motion Blur - Normal
Tessellation - OFF
Vsync - OFF
1)Right-click on computer > Properties
2)Click Advanced System Setting
3)On Advanced Tab > Performance > Click Setting
4)A new window will open > Click on Advanced Tab
5)Ok here is the tricky which you must do it correctly. Just follow this step :
a)On Processor scheduling > Tick the Program just below it.
b)And then on Virtual Memory, open "Change"
c)Untick > Automatically manage paging file size for all drives.
d)Click drive C: > Tick "Custom Size:"
e)On initial size put 7000 mb and do it the same on maximum size.
f )After finish tweaking press set and click ok
6)Run game as Adminstrator
[SOLVED] Metro Last Light : Stuttering Fix. :: Metro: Last Light General Discussions
This is just what worked for me, and from what I understand you can still mess with the in-game settings and see what works for you.