Yeah I am having simular problems at simular settings. Using FRAPS to tel me my framerate I get about 5-8 frames per second on maximum settings and then about 12-15 frames per second on medium settings with texture quality on low and a lower resoltuion.
Here is my dxdiag report
------------------
System Information
------------------
Time of this report: 9/10/2008, 00:45:22
Machine name: ASUS-PC
Operating System: Windows Vista™ Home Premium (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.080425-1930)
Language: English (Regional Setting: English)
System Manufacturer: ASUSTeK Computer Inc.
System Model: G1S
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz (2 CPUs), ~2.2GHz
Memory: 2046MB RAM
Page File: 1307MB used, 3026MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
DxDiag Version: 6.00.6001.18000 32bit Unicode
------------
DxDiag Notes
------------
Display Tab 1: The file nvd3dum.dll,nvwgf2um.dll is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Input Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)
---------------
Display Devices
---------------
Card name: NVIDIA GeForce 8600M GT
Manufacturer: NVIDIA
Chip type: GeForce 8600M GT
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0407&SUBSYS_15151043&REV_A1
Display Memory: 1013 MB
Dedicated Memory: 245 MB
Shared Memory: 767 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Generic PnP Monitor
Driver Name: nvd3dum.dll,nvwgf2um.dll
Driver Version: 7.15.0011.7595 (English)
DDI Version: 10
Driver Attributes: Final Retail
Driver Date/Size: 6/4/2008 12:32:00, 5877760 bytes
WHQL Logo'd: No
WHQL Date Stamp: None
Device Identifier: {D7B71E3E-4747-11CF-586E-1E3501C2CA35}
Vendor ID: 0x10DE
Device ID: 0x0407
SubSys ID: 0x15151043
Revision ID: 0x00A1
Revision ID: 0x00A1
Video Accel: ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C ModeVC1_B ModeWMV9_B ModeVC1_A ModeWMV9_A
Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
YV12,0x32315659) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
YV12,0x32315659) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
YV12,0x32315659) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
YV12,0x32315659) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
IMC1,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
IMC1,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
IMC1,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
IMC1,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
IMC2,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
IMC2,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
IMC2,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
IMC2,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
IMC3,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
IMC3,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
IMC3,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
IMC3,UNKNOWN) Frames(Prev/Fwd/Back)
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{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
IMC4,UNKNOWN) Frames(Prev/Fwd/Back)
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{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
IMC4,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
IMC4,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
IMC4,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)
S340,UNKNOWN) Frames(Prev/Fwd/Back)
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S340,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
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S340,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
S340,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
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S342,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
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S342,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
S342,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
{B338D50D-A64A-4790-AC01-475B64252A78}: Format(In/Out)
S342,UNKNOWN) Frames(Prev/Fwd/Back)
0,0,0) Caps=
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled