Andrew Trice recently posted on how to Improve Flex Builder Performance. His instructions are for Windows and point in the direction editing FlexBuilder.ini. On the Mac, FlexBuilder.ini is well hidden and not easily found. To change your memory settings on OSX you need to:

1. Use Finder to Navigate to /Applications/Adobe Flex Builder 2/
2. Right click on the Flex Builder application icon and choose Show Package Contents from the popup menu
3. In the Finder window that appears, open the Contents folder, then open the MacOS folder where you will find FlexBuilder.ini
4. You can edit this file and modify your memory settings as outlined by Riyad Kalla.

I upped my -Xms and -Xmx to 1024 and have noticed a performance improvement on my compile/build time.

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