Lag in Portal (Steam)

Hey guys. Got it today since it was free. Looks like a great game with those recommanded requirements :
- Pentium 4 processor (3.0GHz, or better),
- 1GB RAM, DirectX® 9 level Graphics Card,
- Windows® (Win 7)/Vista/XP/2000,
- Mouse, Keyboard, Internet Connection

Compare it to mine below. Here are my settings :

+ Windowed, 1280x768.

I've attached a benchmark I've done with Fraps...

Can people help me here? I want to play that game smoothly. Thanks in advance.

Leave the multimedia class scheduler service running, but disable its network throttling "feature":

* Open regedit
* Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile
* There will be an entry for network performance throttling, default value is 10; set it to FFFFFFFF hex (willl look like 0xFFFFFFFF to the right of the entry)
* Reboot

Tried and it worked. *sigh*

We need a lock now. Thanks for looking.

P.S Now playing @ 1920x1200 and all at high AA2x, Anisotropic 4x, Blur, etc.

Good to hear you got it working. Anyone who hasn't had the chance to play it yet should definitley get it while it's free