It's not a new problem but maybe there's a new solution?...
I have a Flash game in a Director projector. The Flash games
works fine by itself (not embedded in Director), but inside
Director, everything runs much slower. Is there any ways to speed
on top of that you can set the frame rate of your director
movie to the frame rate you want the flash content to run at, then
in the property inspector set Rate to lock step. this will force
flash to run at the same frame rate as the director content.