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A curiosity or a bug ? I cannot said if it is normal ? But...
When I begin to work with Lightroom Classic v11.1 (and older versions too 10.4 and 11) and activate the face dectection module for identifying the face on my picture, during many minute the software works well and perform very well! All processors show activity. On the first picture you have the caracteristics of my computer (Win 10 pro with 64Gb ram, Nvidia graphic card and Intel I7-8700 cpu).
But after some minutes (15 to 20) of intense functionning, Lightroom begin to use only one processor and it slow down severely, face identification begin to be very more difficult. I noticed no more disk actifity or excessive memory usage.
Do you have an idea why ?
I use the example of face detection, because it is more reproductible, but this occur also when I use other functions.
What setting may encourage Lightroom Classic to use all processors?  
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Lightroom Classic 11 and 11.1 are both painfully slow in the Develop module in general. Not really being able to find any tips/workarounds.