The big blue bar just below your video is the Timeline. This allows you to jump directly to a given time in your video. It is possible to simply click on it, or click and drag to review your file.
Segments of the proxy, chosen in the player and previously generated by Artisan will be dynamically loaded according to the requested timing. A certain amount of time before and after this point will be preloaded in order to provide the smoothest possible playback. In case of limited bandwidth, please consider using a lower proxy for a better experience.