Tvheadend

As far I can tell, Kodi forces a HTSP profile when streaming TV. When streaming an ongoing recording, however, it uses whatever profile the recording used. That means that if you use a MKV profile seeking in the recording will require indexing every time you seek past the furthest point in the recording you've reached during current playback.

If possible, I believe forcing HTSP for streaming current/ongoing recordings would improve the experience a lot. Playback should behave as close to live TV as possible.