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I recently purchased a second-hand M1 Pro MBP 14", and when running heavy tasks its performance is ridiculously poor - several cpu-cores are not engaged, for example.

I then ran Geekbench 6, and the multi-core score is only one-fourth of a normal M1 Pro, with single-core performance also significantly below normal values with not all cores working.

The hardware was tested by the Apple Store and no faults were found, and the system was just restored. What could be the issue with my Mac?

I checked that low power mode is off, and I kept the charger connected when running tasks.

https://browser.geekbench.com/v6/cpu/5736206

Here are the test results： enter image description here

and the CPU usage: enter image description here enter image description here

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  • Against which numbers do you compare your results here?
    – nohillside ♦
    Commented Apr 16 at 11:06
  • The normal M1Pro single-core score is 2365, and the multi-core score is 10320. My m1pro is a big gap with it.
    – Chenhao Ying
    Commented Apr 16 at 11:38
  • Is it hot? Is kernel_task running high? Can you return it to the seller?
    – benwiggy
    Commented Apr 16 at 13:25
  • You don't elaborate on what 'heavy tasks' entails, they could be IO bound as well, the system will only run at the speed of the slowest component. Are they designed to take full advantage of the M1 Pro architecture? Note there's a distinct difference in what the efficiency cores vs performance cores are designed to do. There is now a QoS factor to consider. eclecticlight.co/2024/02/19/…
    – Andy Griffiths
    Commented Apr 16 at 21:05
  • The CPU temperature does not exceed 50 degrees Celsius during operation and the fan is not turning. kernal_task is normal. Because the Apple Store didn't detect the hardware issue, I also couldn't return it to the seller.
    – Chenhao Ying
    Commented Apr 17 at 1:51

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