Top: Illustrator exports the fish symbol once to SWF; the scale, rotation, and opacity transformations on each instance can be represented natively in the SWF format. This SWF is roughly 3kb.

Bottom: Because Illustrator tints work differently than what Flash can apply natively, AI10 exports new copies of each symbol when it encounters an instance that has been tinted or styled. This SWF is roughly 54kb. (If you'd like to have SWF-native tints in the symbol sprayer, you should let the Illustrator team know.)