Magic mouse and OS10.7.3

my first post!

I use a 27" imac at work (OS10.6) and at home uses Lion (OS10.7.3). Something has occurred in the newer Lion interface on the home mac that makes the momentum scrolling not to work as smoothly as my Magic mouse at work. In the older 10.6 system, you could turn on "scroll with inertia" or not—now that option is gone in 10.7. In 10.7.3 the mouse scrolling is not as smooth as at work, its kind of jerky and definitely does not scroll as long before the "brakes" turn it off. Anyone else experience this? Has the mouse hardware or software interface changed? thanks