My Lightroom at this point is not work workable... It freezes goes black when using asjustment brushes and spor removal tool.
Yes, if you do a lot of brushing or spot removal, and you have large images and a 4K or larger monitor, this is a common complaint. The CPU or GPU just can't keep up, even though you have a very powerful CPU and GPU.
One thing you can try is to set your monitor to 1920x1080 and see if that helps.
My new system is less powerful than yours. My Lr is quite reactive. Comparing to Capture One may be quite compelling, but are you sure your comparing at the same pace? Software comparission may be quite difficult and you need to create the same conditions. My system has less CPUs (there is a limit on the. number of CPUs that may increase performance), my graphics card is a less performant Quadro, my disk (for the pictures) is a classic hard drive, and still, my performance is very good and compared to my 6 years old system lightning fast.
I do not know, however enough about your workflow and C1 workflow, to be able to suggest what is best to use.
Regards, Abambo Hard- and Software Engineer and Photographer.