I upgraded my Roon core to a new multi core Asus NUC (cost ~1k) recently. Roon is now very stable and very fast. Sound quality continued to sound excellent. That has never been a problem.
So you do need a good streamer, a fast multi core, and good network connectivity for best results. My main streaming is done using ASIO on the same PC to dedicated external Topping D90 III SABRE DAC (with custom Topping provided Windows driver)via asynchronous USB 2.0.
Streaming results can vary depending on exact hardware and software used. Roon does not operate in a vacuum. YMMV. I can easily recommend my current config I have settled on as a good and cost effective complete Roon solution.

