I'm building the basic blocks for my first attempt at a Tower Defense type game, and it's going reasonable well.

But there may become slightly heavier situations in the full game where performance could become a problem (mostly with many built towers on screen).

Would my flash8/as2 project be mostly compatible and loadable in the new flash? and would the performance be worth the jump generally? Is there any major changes from Flash8 to Flash9 that anybody is aware of?