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Leopard Release Notes
The performance of Mac OS X applications and hardware devices can be measured, evaluated, and optimized using Apple's developer tools, technologies, and programming interfaces. Developers can fine-tune their applications for high performance using tools such as the Shark code-profiling application, features such as multiprocessing, and APIs such as the one for the vDSP library.
A guided introduction to improving performance in Mac OS X software.   Essential information for improving the performance of developer applications.   API references, organized by framework.
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Accelerate Release Notes (HTML)
Vector Engines 2007-10-31
Affinity API Release Notes for Mac OS X v10.5 (HTML)
Explains how to influence which CPU core runs a group of threads (for performance optimization).
 Darwin, Hardware & Drivers 2007-10-31
CoreFoundation Framework Release Notes (HTML)
Core Foundation 2007-10-31
Accelerate Reference Update (HTML) (PDF)
Summarizes the symbols added to the Accelerate framework.
 Vector Engines 2007-07-18
Xgrid Foundation Reference Update (HTML) (PDF)
Summarizes the symbols added to the Xgrid Foundation framework.
 Darwin, Multiprocessing 2007-07-18
vecLib Reference Update (HTML) (PDF)
Summarizes the symbols added to the vecLib framework.
 Vector Engines 2005-06-04