I know, you barely even see the maximum RPM achieved, but I did slow down the video immensely to find it. If you don't believe me, I can upload a video slowed down a fuck ton to show. The average (when at high speed) is like, 450 or something.
STORY TIME YAY:
My right arm muscle shakes violently when I flex it, and it's been like that for as long as I remember (18 years old now). Being the gamer I am, naturally I've utilized this arm shakiness for my own good. I can hyper-click buttons in games like Mario Party and shit, basically any time where I have to click a single button really fast, and I can totally own any normal player. Recently, having gotten back into osu!, I found out that I can use this same muscle shakiness to spin the spinners really fast in osu. It took a bit of practice to get the right rotation down, having to position my thumb and pinkie on the table correctly (mouse playing, not tablet), but now I can rape the fuck out of spinners if they aren't too short or too long (like in this video).
Problem about doing this though, is my arm gets tired quite fast, so I can't keep up the shaking for very long without my arm getting tired. However, I am capable of getting just slightly lower than the auto-spinner (when on auto play, it's like 477 RPM or something). Usually I get around 400-450 when I'm casually playing, but I felt like pushing it to see how fast I can go. But for now, my arm is tired, so I'll stop. I may try to get that 477 (or more) in the future. If I achieve that, I'll record and upload to gloat my awesomeness.