HT203171 Trackpad works very poorly with OSX 10.7.5 on a new Mac Pro

I tried everything in the support article to no avail. The cursor jerks along erratically and is virtually useless except for gestures like changing pages or zooming. Simply selecting a place on the screen to click, however, is tedious and nowhere near as easy as just using my decade old trackball.

Compatible models:
•     iMac (Mid 2007 or newer)
•     MacBook (Late 2008 Aluminum, or Early 2009 or newer)
•     MacBook Pro (Mid/Late 2007 or newer)
•     MacBook Air (Late 2008 or newer)
•     Mac mini (Early 2009 or newer)
•     Mac Pro (Early 2008 or newer)
•     Xserve (Early 2009)
http://www.apple.com/osx/how-to-upgrade/

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