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Your problem is you are using a CPU with m,ore than 4 cores. LR does not like CPUs with more than 4 cores. This has been well documented on the other Adobe forum site.
Although that thread is about the Xeon CPU it is also turn for the "i" series of CPUs.
There is nothing you can do until Adobe updates LR to function better on CPUs with more than 4 physical cores.
But what has the number of CPU cores to do with Lightroom does not use the folder as I have assigned to Cache?
I have problems with the program is very slow.
Please describe exactly what steps in Lightroom are slow. Be very specific.
When I import images and apply face recognition. When I sort the faces, slices of Lightroom. "Not responding", and it may take 2-3 minutes where my computer is locked
I have use the "Optimize Catalog" and "Build 1:1"
Preformens is still bad, and it surprised me why the Cache folder is totally empty when the application is running.
Why lightroom not cache folder?
The LR Camera Raw Cache is only used by the Develop module when editing raw image files (CR2, NEF, ORF, etc). Until you have edited raw image files in the Develop module the new Camera Raw Cache folder will remain empty.
Conversely the Library 1:1 Previews are only used in the Library module and have no affect on performance in the Develop module. It's Previews are built real-time and will take longer to render when reviewing images.
As Just Shoot Me mentioned LR is known to have performance issues using AMD, i7 and Xeon processors with 6 or more cores. This is most likely the cause of your performance issues: Lightroom: Slow performance on Xeon CPUs | Photoshop Family Customer Community