When I upgraded from 23.1.7 to 23.1.9 a long time ago, my system started to show strong oscillations in CPU use, from 0 to 100, all the time. It would reach 100% about every 10 seconds or so. Because of the high average CPU, the temperature of the system went up by a couple of degrees. I have lived with this ever since because I couldn't isolate what was driving it.
After I upgraded from 25.1.7_2 to 25.1.7_4 and now 25.1.9_2, this oscillation has disappeared and now I am seeing a nice smooth line of CPU use (obviously subject to traffic volume). System temperatures are also lower.
Just thought I'd thank all the developers for continuous improvement - I have no idea which component makes the difference in my case, but this was a long-desired improvement.