Lag time on web?

i have a movie that has animation synched up to a soundfile. It runs the way it is supposed to in the dev environment when i press ctrl-enter. However if i publish it to html using F12, or load it to my server the animation falls out of sync with the music. I have tried using a preloader, but apparently the file isnt big enough to require a preloader because the preload counter is never displayed. Any reason why this would be happening?