This from Adobe...
Flash Player is a language runtime. We process ActionScript written
by the content provider, and do all the nuts-and-bolts stuff, like
allocating memory and rendering pixels to the screen. Game developers
often times push the edge of what's possible with Flash, and don't
always write the most efficient code.
We make a performance profiling tool available for content
developers called Adobe Scout that allows them to track what code is
spending the most time on various activities, so that they can identify
and optimize hotspots.
It's unlikely that there's a generic fix that we can make that will
magically improve performance for this one game. The best course of
action is to report the performance issue to the game developer, and
encourage them to profile it using Scout. If they identify a specific
problem with an ActionScript call that's super slow or something,
they'll be able to isolate that case and ask us the fine-grained
technical question necessary to either identify an actionable problem,
or provide them with a recommendation on a better approach, etc.