This only affected me when I updated my OSX this morning to Sierra 10.12.
The trackpad scrolls too fast but the magic mouse works fine.
Changing trackpad settings does not resolve the issue.
I just updated my Mac to Sierra 10.12 . Now my minecraft does the same fast-scrolling thing. How is this resolved?
Now it's happening to all my computers after Sierra Update.
I just updated my iMac desktop computer this morning to OSX Sierra.
The problem of scrolling too fast is now on this computer too! So now both my macbook pro and imac have the same issue.
It can not be fixed by adjusting the scrolling speed in Accessibility or turning off inertia while scrolling.
My issue of scrolling too fast is without a doubt related to the update I just did to my operating system.
I never had this issue before with any updates to my Mac computers.