My brain doesn't either :)

Hah, it depends on the video/podcast I'm watching/listening to for sure, but sometimes 2.5x/3x is very nice.

I think I sort of built it up over time though, I remember not being able to do 2x previously because it seemed to fast, but I guess I got used to it.

I can barely do 2x, I should practice then! Depends a lot on the speaker too.

Many (most?) vision impaired people can.

i was once told vision impared people can do much faster than that if it's a flat computerised voice. so i started reading articles like that for a while. i had to do a bunch of manual/automatic handling, but i got it up to super fast speeds and i could read it thrice in less than the time it took to read it once. not bad!