I don't have an Xbox but my PC is connected via ethernet to my 1Gbps connection and I get a max of about 50MB/sec (though it fluctuates wildly) when downloading Game Pass games. Steam and the PS5 will usually max it out though.Do you hardwire xbox to network?
Wondered if MS/XBOX cap the the speed on xbox or if you can max you ISP speed. I connect over wifi and always got an average of 150-180mbps on my Virgin 350 line, but moved up to 500 package and get a around 250-300mbps now over wifi, not bad, downloaded Starfield in no time.
If I had the connections available, I would test the speed via cable.