Runs great on PC's but lags severely on MAC's

Hey everyone, my game runs excellent on any pc that I have tried it on, even my old dell vostro from 200t, it runs great maintaining at 60 fps, but when I try it on any MAC, even brand new ones, it lags really bad.  Has this happened to anyone?

Are you talking Flash in browser or native builds for those platforms?

It does it when I export a .swf file.