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Leopard Reference
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.
Performance Topics
View the complete Performance Reference List.
Carbon
Facilities for measuring, evaluating, and improving Carbon code performance. 		 
Cocoa
Facilities for measuring, evaluating, and improving Cocoa code performance. 		 
Graphics & Imaging
Resources for measuring, evaluating, and improving graphics performance.
High Performance Computing
Support for improving the performance of cluster and grid computing. 		 
Storage
Facilities for measuring, evaluating, and improving storage device performance. 		 
Vector Engines
Acceleration of computationally intensive calculations on Intel and PowerPC processors.