Thanks Jeff. I'm not performing any scaling so that makes sense. Re: File size, you are correct in that too large of a file or bit rate does cause stuttering. My goal for the export is to match the image and sound quality that I"m seeing in the PP timeline.
Vimeo works well but exporting a 10 minute timeline took 2.5 hours. After making re-edit adjustsments, this process can easily eat up an entire day. I was looking for a fast media export solution.