I had a Dell Tower dedicated just to running Roon core and nothing else hard wired to my network. A Roon Nucleus was a big and noticeable step forward. The CX will blow your PC out out the water. Not what you want to hear I am sure but PCs just have too much going on, have noisy power supplies, etc....
I have not tried tvad's suggestions. They might work. Not sure. Certainly can't hurt.
I have not tried tvad's suggestions. They might work. Not sure. Certainly can't hurt.