Low mb / sec with the xbox?

I'm with Telekom and have a contract of 250 Mbits downloads and 40 Mbits which also arrive, for example, on my PC during a speed test with a LAN cable. My Xbox is also connected directly to the router via a LAN cable. I'm currently downloading Rocket League and of my 175 Mbits only between five and ten Mbits arrive at a speed test on the Xbox around 50 and 150 arrive how can that be?

This can be due to the port exposure once on the router afterwards you should not set the DNS server to automatic

Just give it to youtube

this one:

dns customize xbox

the first 3 videos look promising

Do you know the difference between mbits and mbs the xbox has a display bug