Mine has just kept getting faster and faster, thanks to this Chrome extension[1]. Right now I average 2.5x speed for most videos, and 2.2x for people that talk fast.
Firefox, YT only: https://www.mrfdev.com/enhancer-for-youtube The improved playback speed ranges from 25% to 400% (also 800% but without audio) in adjustable increments.
For offline videos, VLC also is capable of changing playback speed.
Edit: I see some podcasts app have something similar (albeit opposite). It shortens dead space between two people talking and try to not affect the speed of their speech.
I find that most videos are understandable up to 3x. I watch most of them at 2.5-2.8x, down to 2x for people that talk fast or with a hard accent. Same for podcasts.