I have to slow it down to 2.4x for speakers with even minor less-familiar accents.
I'd like to get to a general 3.5x speed if possible, although hours and years of practice have still left me at my current plateau.
I am not a blind person (they can comprehend speech at incredible speeds). I'd like to be able to do other things while listening at high speed (e.g. walking or doing dishes).
How do you increase your listening speed without losing comprehension?
Are you feeling like there is a wall at 2.700? Can you gradually increase to 2.71, 2.72, etc?
Can you listen to the same recording a second time at a faster speed to train? Or the same person in a new recording? Individuals vary their speed, one guy I noticed sounds completely normal at 2x just because he’s a drawler. I think you’d need a consistent speaker to retrain on in order to measure your progress.
You want to do dishes and walk, but closing your eyes and shutting out other senses is probably a good way to go faster at the expense of multitasking.
Edit: another thing is that the x speed has diminishing returns just like speeding. 2x cuts time in half, but 4x only saves you half as much time, so you’re really not saving as much as you might think but getting to higher and higher speeds. Going from 10x to 20x if possible would only save you 3 seconds over a minute of listening. Going at 2.7x you have already saved 63% of the conceivable time savings.