Video should always be optimized for the Web. If your videos are too large, they will be slow to load and will not perform well. You may see stuttering and stopping along the way. Usually this is pretty easy to fix. We have a step-by-step tutorial video that covers this issue.
If you think your video's performance problems may be caused by the way it was originally encoded, please review the Video Encoding tutorial here:
If your issues are not resolved after following this tutorial and updating the video configuration with the new video source, you could try to break the video into chunks, then link them together with the Yuvid Action Buttons or Redirect function.