Xbox One S wired speed slower than wireless?

Wireless connection will give you a slower connection speed then using a wired connection.

You don't say if you are using wired or wireless.

Your brothers stats look like he is using a wired connection which would explain his COD being less laggy.

If your connection is wireless then that is very unreliable. Wireless can cause slower speeds, packet loss, higher pings and lag.

From personal experience I have found BT hubs have terrible wireless.

I have had a homehub 2, homehub 3 and now a homehub 5. All of them had crap wireless. Speed are a lot slower via wifi than they are when wired. Also I get more packet loss and the ping is a bit higher.

If you are using wireless then you should try using wired to see if that makes a difference.

I personally have not experienced slower than normal download speeds but I keep coming across different people complaining about theirs being slow. Like one of the other ambassadors mentioned there are numerous reasons that can cause slow speeds. One of
my buddies recently changed his set up from wireless to wired and he noticed an extremely faster download rate. If nothing else works its worth giving it a try.

Wi-fi is much slower than a hard wired connection.

You should always use a cable when possible

Xbox One supports up to Wifi N routers

Xbox Series support up to wireless A/C routers

Don't worry there isn't a speed limiter installed on the Xbox 360 for either wireless or wired connections. The simple fact is, those sites are no where near accurate. I live a long way from you - In the United Kingdom, and I get measurements from HTML5
speed testing sites that are no where near my actual speed. I've tested it from my Xbox wired and wirelessly, and from my PC which is wired.

The tests I've done state my download speed is between 4 - 9Mb/s. My actual speed is more like 60Mb/s down. I get the same slow speeds recorded by the HTML5 speed test sites that you are getting. Sometimes they report much higher, mostly not.

If you're getting slower web browsing speeds on the 360's Internet Explorer compared to your PC, this is down the console and the browser, not your connection speed. As for the marketplace, it depends on how MS have configured their network and how many users
are trying to download the same thing.