Flex 4 RSL's and how to not use them
Flex 4 allows and defaults to using Runtime Shared Libraries (RSL's).
These have advantages of making flash movies using them work very well, but they can also require more http requests the first time they are used, and are not good for application development with Northcode.
To turn them off you need to add the following compiler flag:
Thanks to Flex Butterflies and bugs for the info.