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Description
As per the following thread (and reply by Philippe)...
http://www.flashdevelop.org/community/viewtopic.php?f=9&t=12412&p=54339
... it appears that the mechanism for Find All References is not properly optimised for protected members; as it appears to search all classes (even intrinsic Flash classes) in the project.
Obviously, for a project-level class with protected methods, only its subclasses would be able to access these, so only those files (if any) should be searched.
There may also be other optimisations available, for example not searching instrinsic flash classes (though the ones in my project may have been from an SWC - difficult to see as the search box only flashes up for a few seconds!)