Most notibly what happens is, I have an ExternalInterface callback that
receives javascript updates, and uses them to move an object on stage around.
Everything works great, until I right-click in the browser. Then the
ExternalInterface call acts sluggish, only updating sporadically as opposed to
immediately, as it does before right-clicking....

Everything is a-okay, until I right-click, then the ExternalInterface updates are sporadic, only updating onscreen after I release the browser scrollbar.