Dishonored is lagging even though I have a good computer, The alienware m17x. Its not a heating problem, I checked the temp and everything seems to be running normal.
Here are my specs:

Machine name: MIKE-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120830-0333)
Language: English (Regional Setting: English)
System Manufacturer: Alienware
System Model: M17xR3
BIOS: InsydeH2O Version 1.0 A09
Processor: Intel® Core™ i7-2630QM CPU @ 2.00GHz (8 CPUs), ~2.0GHz
Memory: 8192MB RAM
Available OS Memory: 8140MB RAM
Page File: 3744MB used, 12533MB 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