Document Revision History

This table describes the changes to Performance Overview.

Date	Notes
2013-10-22	Removed obsolete references to Shark.
2010-05-14	Updated the Apple developer information.
2009-07-07	Updated the thread guidance to include Grand Central Dispatch.
2008-03-28	Updated for OS X v10.5 and iOS.
2006-10-03	Updated the advice about using Velocity Engine to reflect using the Accelerate framework, which supports multiple platform architectures.
2005-04-29	New document that introduces the factors that determine performance.
	Some information appeared previously in Performance Fundamentals and Finding Performance Problems.