My car was in for a service at the local dealership yesterday & oddly enough I have a similar problem with my driver side window making a squeaking noise but only when going up. I asked them to take a look at it as they had the car all day anyway as I'd be at work. When I got the car back, they told me it's due to the rubber seal perishing & nothing to do with the regulator, it would be £98 to supply & fit.
It's nowhere near as bad as the video linked, my understanding that is if the window is getting stuck or becomes slow, that will be your regulator.