At 1/4th the speed idling moves fine, but the individual pixels don't have time to reset properly and some artifacts can be appreciated (1ms refresh time 27" IPS panel)
What's wrong with "9000 RPM is faster than my screen refreshes" or "9000 RPM is faster than most screen refreshes" or "9000 RPM is faster than an average screen refreshes"?
"Shocking" news that is anything but. "Little known facts" that are widely known. "Mistakes your making with ..." that you've never once made. It's all just trying to get you to consume the content.
Back in the pre-history of Radio (before and during WW1,) electro-mechanical alternators were used to generate low frequency RF in powerful transmitters. Some of those designs would spin at 20K RPM.
Going from 60 to 144 hz in games was great. Certainly noticeable. Going from 144 to 240, it's much more subtle. I'm not sure I'd even notice 500 versus 240 unless I had them side-by-side.