If it is the mouse wheel that you are using for scrolling, you need to look at your mouse drivers and setup. in the mouse settings there is a section for the scroll wheel and how fast it scrolls.
If it is the scrollbar or scroll arrows on the pages themselves, consider looking into the video drivers or video refresh rate. If your refresh rate on the monitor is 60 hz, move it up to at least 70 hz.
make sure you have the latest vid drivers installed for your video card.
hope this helps.