Speed up Flash Builder 4 compile times

1] If your project has multiple application targets, everytime the project rebuilds it rebuilds every application in your project. So if you have 4 targets, things can get slow fast. To remedy this, right click your project, click Properties, goto Flex Applications, and remove the applications your not currently running. Set the remaining application as default.

2] If your project has many files, when the project rebuilds it will copy them into the bin-debug folder which could take a long time, Right click your project, click Properties, click Flex Compiler, uncheck Copy non-embedded files to output folder. You will have to copy files to the bin-debug folder manually if any assets are required.