Back from a long vacation...
So you are saying I am trying several applications but not the one you suggest and that makes me lazy
I am well aware of the 3C family of tools. They all look very unreliable. All of them are showing only cores 0 and 7 awake and working on max clock. All other are offline. There are just some tiny moments in which some of the other cores are online but then they go offline again. And it does not depends on the CPU load. So again - it is either the application is showing fake info or the phone kernel has no idea what it is doing. Also I am noticing that after working on the phone for 10-15 minutes and it gets hot it starts to lose WiFi signal (the signal is poor).
Hey don't worry. I am not demanding Blackview to fix this. I know they are not capable of fixing it. I will just buy a normal phone when this one dies totally.