Flex Performance

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Get flash to fully experience Pearltrees
http://www.adobe.com/devnet/flash/articles/optimizing-flash-performance.html Currently, the only way I know how to measure this directly is to use an operating system tool. Windows includes the Windows Task Manager (performance tab) and Mac OS provides the Activity Monitor.

Optimizing Flash performance

http://divillysausages.com/blog/tracking_memory_leaks_in_as3 If you're a super cool, handsome Flash dev like me, memory management is an important part of your daily coding routine.

Tracking memory leaks in AS3 | Damian Connolly | divillysausages.com

CPU

Round up of ActionScript 3.0 and Flex optimization techniques and practices - InsideRIA

About You have arrived at this page because InsideRIA is no longer an active website, as of January 31, 2011. http://oreilly.com/insideria/index.html
Reduce swf size

Updated ‘Elastic Racetrack’ for Flash 9 and AVM2 « Craftymind

http://www.craftymind.com/2008/04/18/updated-elastic-racetrack-for-flash-9-and-avm2/ In 2005 Ted Patrick posted a great article on the frame execution model inside the Flash Player that he dubbed the ‘ elastic racetrack ‘.
http://code.google.com/p/bulk-loader/

bulk-loader - Project Hosting on Google Code

ATTENTION: this project has been migrated to github at http://github.com/arthur-debert/BulkLoader . Please, use the issue tracker there, as well as source and dowloads. BulkLoader is a minimal library written in Actionscript 3 (AS3) that aims to make loading and managing complex loading requirements easier and faster.