Subtitle causes jerky playback in preview monitor

Well the subject says it all. The timeline plays fine in the monitor but when I add the subtitle the playback starts and stops and is very jerky. If I delete the subtitle then everything plays fine. Any thoughts?
Thanks,
Paul

That seems like a pretty able system. Have you got plenty of drive space?
The real check is to burn a DVD and check your playback there. I reckon that will be fine.

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