You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
ValveTime.co.uk | Valve News, Forums, Steam
We added an option that you might want to try that may fix stuttering problems for some people. We didn't get enough testing on this particular fix to risk everyone running it by default quite yet:
To enable:
1) Right clip on game (Half-Life 2) in the Steam "Play Games" menu.
2) Select "Properties"
3) Select "Launch Options"
4) Add: