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Old 07-07-2021, 12:01 PM   #2
Per Hansson
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Default Re: Apple iMac A1418 Late 2013 - Fan run at max.

I'm just guessing here but that should not make it run slow.
Check if you can find any program that can check the temperature of the CPU.
Perhaps it is genuinely high: then it will clock down to protect itself.
A likely reason could be bad thermal compound between the CPU and heatsink.
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