Very large utterances make detail viewer unusuable

[MichaelGoodale]

If you have a very large utterance(say 600 seconds), the detail viewer is unusuably slow. It might be good to allow for someone to just look at part of an utterance at a time. Not sure exactly how this would work, but perhaps people could supply a set of times they want to look.

[msonderegger]

@MichaelGoodale I assume this is low priority because if "utterances" defined correctly there shouldn't be any which are anywhere near this long?

[MichaelGoodale]

@msonderegger Yes this only really would happen if the pauses aren't encoded correctly, or if a speaker is just really not taking any breaths.