choppy playback only in dreamweaver

Hi all,
I have perfectly good flash vids that when put into dreamweaver, the play back is choppy. It appears as if a 30 frame video is playing back at 15 frames.
I used INSERT MEDIA in dream weaver and inserted the flash video. but when I preview in IE, it's slower. I looked in the properties in dreamweaver, but there are no setting to tweak it. It seems very stright forward. Drag & drop into dream weaver, i can't imagine why this is happening?

Anyone had this problem?

Thanks,
Lou