I strongly disagree with this statement. Every new version of Windows feels slower than the last one. Linux DEs are either very outdated and very snappy or somewhat modern and only barely snappier than Windows. I have zero experience with MacOS.
CRT screens were also 60Hz.
Look at the latency along all steps of the pipeline to get a keypress visible on the screen... https://danluu.com/input-lag/
Many were above 60Hz and it depends on resolution. An iMac G3 for instance could do 75Hz at 1024x768 or 640x480 at 117Hz. Someone recently got a CRT at 700Hz too:
No, an extra ~17 msec of delay is not even close to the cause of this. The speed difference between older and newer UIs is still apparent even at 60 Hz.
