Process monitor on Linux shows wrong process load #51200

I often see the process explorer showing load long after that load happened and only slowly ticking backward.

From #50597 (comment):

The process explorer and --status are both using ps to get CPU usage. Linux documentation for ps says "CPU usage is currently expressed as the percentage of time spent running during the entire lifetime of a process. This is not ideal, and it does not conform to the standards that ps otherwise conforms to.