Mouse Smoothing:
As the name implies, ticking this setting will mean your mouse movements will result in smoother movement on screen. Ticking this option will not affect your framerate appreciably if at all.
Some of these settings are set up as constants in game code. So, for example, if you want the mouse smoothing strength to be modifiable from the settings menu move the slider to increase or decrease it. This selection variable variable would be altered by a function called when a user modifies the setting. The mouse smoothing function would then use this variable in its algorithm.
Essentially it would be having the many mouse movements on the X & Y axis points averaged - then that average is applied to the mouse decreasing jerkiness & "smoothing" its motion. It also increases the "refresh rate" of the mouse.
For gamers it would be important in some cases to check the default "out of game" mouse settings in the control Panel untick the mouse acceleration if the mouse makers software does not have a setting to "disable acceleration in games" select that.
I took this off a site - a good read.
http://www.planetunreal.com/inoxx/hardcore/hardcore.htm
"Mouse Smoothing is a nice option if you don't have better: the standard Windows 95/98 Mouse is terribly slow, it uses a refresh rate of 40 or 44 Hz, that means that if you play and you have 80 fps, your screen will be refreshed every 12 milliseconds, but your mouse can only send information to the PC every 25 milliseconds. It's extremely annoying when you turn the head, because the mouse refresh rate is so low that it's very jerky, loosing all the benefits of a smooth, fast Framerate. It's really disturbing to realize that you have a hardcore PC with a fast, expensive CPU, a fast, expensive Graphic Card, everything well tweaked to have the maximum Framerate, but the overall gaming experience can be completely spoiled by a $20 mouse which can't transfer your orders properly to the computer.
Luckily there are 2 solutions. When you enable Mouse Smoothing, the motion is interpolated. It's not perfect but it's a tremendous improvement and most players will enjoy the game like this. But Hardcore Deathmatchers are not "most players" and they need something better.
Download PS2Rate, this program is awesome if you have a PS2 mouse ( that's the Round Plug, if you have the rectangle one, called Serial, you're out of luck ) and I have it running on my PC all the time. Basically you can change the refresh rate of your Mouse up to 200Hz. Now that's accurate ! So if you use this program, you won't need Mouse Smoothing. If you have a USB mouse, the refresh rate is 125 Hz so you probably won't need mouse smoothing either.
Logitech Mouse drivers for windows have a built-in 'ps2rate' slider where you can change the sampling frequency of your bus mouse too. Fianlly Windows 2000 has an option somewhere to adjust your mouse speed. Since I don't have this OS yet I can't tell you where."
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