I have three iMacs connected to my router. All Intel, all running at full network strength (~350mbps). All are wired to the router. I have now replaced one with an M1 Mac Mini. The connection is as slow as <insert word here>! Wireless barely reaches 50mbps download, although it has gone down as low as 10! Upload speed remains a steady ~30mbps as has always been the case. Network stability is also a major issue. Wireless connection to the Mini from my other machines is slow and unreliable; as it's in another room, I can't connect directly via ethernet, but I bought some powerline adaptors, which 'promise' speeds around 1gbps, but my standard connection speed is way below that anyway. Either way, this is unworkable. Is this down to the router (Hub3) or network settings? Connection between the machines is easy enough to do; it's the speed and stability that's the issue.