So here's my problem. I have a rather new computer.
and the games really runs slow. I have the newest version of the game and drivers for my graphic card. Even with the lowest graphics the game runs slow.
BUT when I tab out of the game and then tab in again it runs really smooth for about 5 seconds and after that it runs really slow again.

anyone having a solution?

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System Information
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Time of this report: 5/4/2007, 11:34:19
Machine name: HELVETE
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.070227-2300)
Language: English (Regional Setting: Swedish)
System Manufacturer: INTELR
System Model: AWRDACPI
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM)2 CPU X6800 @ 2.93GHz (2 CPUs)
Memory: 2046MB RAM
Page File: 757MB used, 4204MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

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DxDiag Notes
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DirectX Files Tab: No problems found.
Display Tab 1: The file nv4_disp.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.
Display Tab 2: The file nv4_disp.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.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.

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DirectX Debug Levels
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Direct3D: 0/4 (n/a)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

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Display Devices
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Card name: NVIDIA GeForce 8800 GTX
Manufacturer: NVIDIA
Chip type: GeForce 8800 GTX
DAC type: Integrated RAMDAC