Okay, so I just got a new video card (Geforce gtx 550 ti), and I'm experiencing terrible lag in Metro 2033... I'm playing it on normal quality, DX11, AAA, and AF 4x. I downloaded Fraps and it said the game was running at about 5-10 fps (even the menu screen). Here is my dxdiag:
Time of this report: 8/4/2012, 19:10:39
Machine name: ANDREW-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: Default System BIOS
Processor: AMD FX(tm)-4100 Quad-Core Processor (2 CPUs), ~3.6GHz
Memory: 8192MB RAM
Available OS Memory: 8176MB RAM
Page File: 2374MB used, 13974MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Input Tab: No problems found.
It says 1366x768, I would expect you to be getting more like maybe 20fps, not really playable either, the game demands alot theres not many gpus out there that can play it happily. Make sure you've got the latest drivers anyways.
Off topic, but is that your youtube channel of the same name?