Out of curiosity, did you turn on Task Manager to see how system resources are being allocated?

Unfortunately, buying computers these days is no longer like comparing cars and more like comparing business enterprises. As such, there's seemingly always going to be some weird weak link in the inner operations that makes some things super slow from one system to the next.

You might consider remote access software to operate your laptop from The Beast for an optimized experience. You may experience latency, however.

If your laptop and desktop have redundant network cable ports, you might cut that down through connecting them via ethernet cable. (But extra ethernet cards aren't expensive, assuming your hardware will support it.)