I also noticed my CPU temperature is higher while my Task manager is not open, which proves what I said.

I was monitoring my CPU load on a third party application and it constantly shows 100% CPU usage until I open Task Manager. I have read somewhere that my CPU is not actually on 100% of usage and it's just showing it like that for a few seconds when I run Task Manager until it loads the real CPU usage, but that's not true. Its not the problem with my CPU because I have tried my PC with another CPU and still happening.

I was trying to find an answer on the internet but I couldn't find it. It looks like this background process always leaves me enough resources so I can do whatever I want on my PC without noticing something is happening in background.

I have no problem working on my PC while CPU is on 100% usage. Does anyone know what could be happening? Also, my Task Manager automatically closes after a few minutes of using it, so when it closes my CPU percentage comes back to 100%. When I open Task Manager it shows that my CPU is on 100% and after a half seconds it dramatically drops to 15% which is normal usage when I am doing nothing on my PC. My CPU is working at 100% (while I am idle) until I open Task Manager.

Monitor cpu usage windows 10