CPU suddenly slow?!?!?!
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Solved by unclewebb,
Your CPU is severely throttling and is stuck at 800 MHz, likely because of a bad sensor on your motherboard. Try running ThrottleStop and on the main screen, make sure BD PROCHOT is not checked. This will block external throttling signals from getting to your CPU.
https://www.techpowerup.com/downloads/2815/throttlestop-8-30
After that is fixed, try running something simple like a single thread of the built in TS Bench test. Take a screenshot while your CPU is loaded with that test and it should show if your CPU is able to go higher than 800 MHz.

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