Apple Performance Update 1.0: No more spinning beachball of death?

I have been infrequently getting the annoying spinning rainbow beachball of death on my 13" MacBook Pro with Snow Leopard, most noticeably while using Safari 4. It almost seemed as if the hard drive was failing, but after each pause everything was fine, and Disk Utility showed no problem with the drive. I then thought it was Snow Leopard itself, but it turns out it may be caused by hard drive pauses associated with Apple's latest Macs. This is hopefully corrected with the Apple Performance Update 1.0:

This update addresses intermittent hard drive related pauses reported by a small number of customers.

Products Affected
MacBook Air (Mid 2009), MacBook Pro (17-inch, Mid 2009), MacBook Pro (13-inch, Mid 2009), MacBook Pro (15-inch, Mid 2009), MacBook Pro (15-inch, 2.53GHz, Mid 2009), iMac (20-inch, Mid 2009), MacBook Pro (17-inch, Early 2009), MacBook (13-inch, Early 2009), MacBook (13-inch, Mid 2009), MacBook (13-inch, Aluminum, Late 2008), MacBook Air (Late 2008), MacBook Pro (15-inch, Late 2008), iMac (24-inch, Early 2009), iMac (20-inch, Early 2009), Mac mini (Early 2009)