Vsync in Flex/Flash/AS3?

Question

I work on a 2D shooter game with lots of moving objects on the screen (bullets etc).

I use BitmapData.copyPixels(...) to render entire screen to a buffer:BitmapData.

Answer 1

Don't save things to BitmapData, that will kill, absolutely kill your app. Bitmap Data is not very performant.

Make all your game elements in flash, as Sprites(or MovieClips if you must), and then work how flash was meant to work, as a vector animation platform. It was never optimized for 2d bitmap graphics. 2d vector graphics work well, and even if you import bitmaps they will work better moving around then they will rendered to a BitmapData object.