Thanks! I was just coming here to mention that. Macroexpanded:

%CPU utilization is a lie - https://news.ycombinator.com/item?id=45110688 - Sept 2025 (162 comments)

Also these past discussions of the OP:

CPU Utilization Is Wrong (2017) - https://news.ycombinator.com/item?id=36580006 - July 2023 (57 comments)

CPU Utilization Is Wrong - https://news.ycombinator.com/item?id=23827032 - July 2020 (1 comment)

CPU Utilization is Wrong - https://news.ycombinator.com/item?id=14301739 - May 2017 (91 comments)

The problem (or really, nuance) comes when you try to define what "run exactly at 100%" means.