I watch nearly all youtube videos on 2x speed and sometimes wish it would go faster (all video services that don't have this are evil). If you are right about voice consistency allowing for going even faster that would be awesome. Will just need accurate voice->text to speed it up even more.
On windows you might like to try Daum's Potplayer. It's extremely lightweight software with tons of handy features and will play both youtube videos and playlists and scale speed all the way to 12x.
I use it for most youtube videos just to decrease my firefox memory usage and improve its responsiveness.
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