Thanks to cpupower in "conservative" mode, my PC's processors heat up even less and I haven't noticed any loss in performance.
What is significant in "conservative" mode is that in iddle mode, the processor no longer has these frequency peaks. This causes the CPU fan to ramp up for a few seconds, which is annoying.
I configured my PCs in "conservative" mode, including two old entry-level laptops from 2010.
I am using Artix XFCE OpenRC.
sudo pacman -Sy cpupower-openrc
Run cpupower at startup (openrc):
sudo rc-update add cpupower
To set "conservative" mode at startup:
sudo nano /etc/conf.d/cpupower
Adapt this line:
START_OPTS="--governor conservative"