Performence lagging

Hey guys.
Well i was just wondering if ne one new how to get the best performence out of a flash 8 project.
Coz Im using nothing but pure vector gracphics i draw everything i need in my flash project in flash its self and i have the framerate set at 24fps and say i have a few animations playing and something else with a bit more effect on it plays it lags a bit like the framerate drops or something untill the animation finishes.

So yeah does neone know what could be causing this, im not using ne of the filters besides the alpha settings and i doubt its my computer coz here are my specs.

Pentium 4 2.80ghz
1gig of ram
win xp home
64mb grpahics card

so i highlly doubt its my computer and no i dont have ne other process’s running in the background.

it lags with both exe and swf and ive fiddled with the publish settings but not really gotten ne where so help would be appreiciated.

Thanks for reading hope someone knows why this happens.

P.s its quite a big fla im working on its around the 20mb area this is a large project sim im making and i need to get the best smoothest performence out of it i can.

thanks again