I'm using Chrome, and the scroll rate is like 3 lines, and it's painfully slow. My finger gets tired really quickly on long pages. System → Preferences → Mouse lacks any scroll wheel configuration options.
Ubuntu – How to change the mouse wheel scroll rate
mousemouse scrollmouse-wheelscrollingxorg
Best Answer
The fix for me for this (I had it for months) was pretty surreal and like most folks I didn't believe it until I did it:
Some MS mice have a scrollwheel bug.
Also, I noticed that if you have the dongle plugged in to the computer and the mouse has an on-off mechanism then you can just turn the mouse off and back on. That resets the data link between the mouse and dongle.
:)