There is a way of changing the IDE 2.x.x Serial plotter to display 500 points like the IDE version 1.x.x does.
(That would make it look like J-M-L's plot in post #9.)
Details are shown how to do it at: https://forum.arduino.cc/t/serial-plotter-output-too-fast/1233965/9.
I don't claim to be the originator of this information, the original work is by Alex-Tsyganok.