Windows – CPU under load despite removing all process affinities

affinitycpu usagewindows 10

I've installed Process Lasso and in All processes tab, set all affinities to 1-7, meaning that all the processes can be start on all my CPUs except the first one. Yet, there is a huge load on my first CPU.

I personally have no clue what's happening here and really appreciate any help.

My system is:

  • Intel core i7 – 4720 HQ 2.6 GHz upto 3.6
  • Windows 10 (64 bit)
  • NVidia GTX 950 M

This screenshot, shows the software's interface. Those 8 green bars on upper right show my CPU usage. Also the column called Rules, indicates the affinities on the processes.

Screenshot of my desktop


PS: These are screenshots that show the more familiar Task Manager and Resource Monitor. I've sorted all with respect to their CPU usage. Note that the overall CPU usage is just fine (less than 30% most of the time), but in Resource Monitor, same as the Process Lasso, it's obvious that that most of the load is on CPU0 and the others are almost free.

Also I found out that my total CPU usage, is actually more than all my processes altogether! The orange line in Resource Monitor picture, shows the amount of CPU usage of all my processes. (I did the same in safe mode. Orange line, exactly coincides the total usage in safe mode. So I'm suspecting that something is happening in my normal boot.)

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Best Answer

The heaviest CPU user is now "System" which is Windows itself and the hardest to diagnose.
I suggest to :

  • Run sfc /scannow to check your setup
  • If that finds nothing, check if Windows and all your drivers are fully updated.
  • See if this happens when no processes are running.
    • If it does, then have try booting in Safe mode, and if the problem disappears then some installed product is the cause.
    • If it does not happen, then try to terminate processes when it happens until you find the troublemaker.
  • Try to disconnect all unnecessary devices to see if this is caused by one of them.
  • Run deep antivirus scans by several known such products, including Malwarebytes.
  • You will find some more hints in this article.
  • Otherwise, you will need to analyze the cause, as described in this article, although that requires some Windows knowledge.

If nothing works, you will have to decide if the problem is serious enough to take some risks and spend hours on it.