Kodi includes a built in feature called Kodi Buffering. This feature was introduced by the Kodi group to their users. You can try to allow it although do not expect it to work as anticipated, especially if you are on a low acceleration internet connection. I tried using the buffering characteristic and that seemed to do the job how to speed up kodi buffering but it is better if you use this kind of feature to show the video and do not attempt to view the video by any means.