This is an old revision of the document!
http://unixetc.co.uk/2019/07/07/raspberry-pi-4-real-world-tests/
Realtime
https://www.raspberrypi.org/forums/viewtopic.php?t=228727
https://lemariva.com/blog/2019/09/raspberry-pi-4b-preempt-rt-kernel-419y-performance-test
RPi4 with Python
Install Raspberry Pi Imager to Raspberry Pi OS by running sudo apt install rpi-imager in a terminal window