If you turn the scroll wheel slowly; just one or two clicks at a time then the screen barely moves.

You have to spin it more to get the screen to scroll significantly, and then it's difficult to control how much.

  • So...? What should it be doing? – cpast Oct 21 '14 at 0:41
  • cpast - any more questions? Did my answer below help you? – James T Snell Oct 21 '14 at 18:12

You can configure how far each scroll input from your mouse goes, it's called Scrolling Speed.

Open System Preferences > Accessibility > Mouse & Trackpad > Mouse Options > Scrolling Speed.

screenshot of Scrolling Speed settings in OSX 10.10

You may also be finding the scrolling with inertia to be confusing, you should try turning off inertia from that same menu.

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