Help with sound sync and framerate

I’m creating a site for a radio voice talent who wants me to sync some text to an audio sample he sent me. I’m also using a bunch of effect on the text. The intro runs fine on my high-end PC but crawls on the Mac’s I have access to and hence throws off the sound sync. My framerate is currently way to high which I’ve read makes some comps struggle but does any one else have any suggestions? Also taking apart the audio to cue to the timeline is out of the question. :h: