I understand where you are coming from. Regardless, in most enterprise level (and hi end) home routers and switches, CPU speed does not matter that much. CPU maintains the ’control plane’ and programs the specialized switching hardware. Once that is done, CPU is not even involved in the switching. İt gets out of the way and lets the hw do the packet forwarding. So the CPU speed by itself is not that significant.
The speed limits you are experiencing are 99% of the time, the limitations of your service provider and not due to your home router. İt is extremely unlikely that your PC will saturate a hi end home router, especially if you are using a wired connection
I had a 600 mbit residential service which i upgraded to a 200 mbit business service and i now get much better performance. It had nothing to do with my home router but all due to the change in service by Comcast.