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E6430: lag in Big Sur


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You have an i5-3340M but use the CPU power management SSDT generated for a quad-core i7-3630QM.

  1. remove that SSDT and generate your own one.
  2. remove that CpuTscSync kext too. It's not required. Adjust your OC config (Kernel section) accordingly. 

You'll find things will work much better afterwards...

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