Improvements included faster processors, improved graphics chipsets, and larger hard disks for the low- and mid-range models. OS X 10.9 Mavericks was released on October 22, 2013.įrom Mactracker App: Introduced in April 2010, The MacBook Pro (15-inch, Mid 2010) was primarily a speed-bump of the The MacBook Pro (15-inch, Mid 2009).OS X 10.8 Mountain Lion was released on July 25, 2012.Mac OS X 10.7 Lion was released on July 20, 2011.Mac OS X 10.6 Snow Leopard was released on August 28, 2009.What is the most responsive, efficient, best OS version for a mid-2010 MacBook Pro 15-inch I have been given?
