Ok, this is typical of CS 1.6.
Now, if your using the new nvidia control panel, I want you to go to start>control panel>NVIDIA Control panel>on the left side, click manage 3d settings>click the global settings tab>scroll down to the VERY bottom, you'll see Vertical Sync. Change it to Off, click apply. Thats that.
I believe the frame rate limit in CS is around 500 or something, but whatever. CS by default caps it at 72. So in the console, set
Your framerate should now be 99-100. Even if you rise the cap higher, it will still be 100. There is a way to remove that limitation, but it's pointless and causes problems, so don't even think about it. 100 is enough.
Rudster: You may be right that the performance wont be better in any meaningful way, but the mouse movement is very different between vsync and uncapped, many CS and Quake players in particular can relate to this.
I find it to be much more responsive with VSync disabled. So I leave it off in every game I play. The tearing doesn't bother me.
The only game I have to have it on in is Thief, Thief2, and System Shock2. Otherwise it runs too fast heh.