Why don't construction prices go down?

By the way, is 665 mbps acceptable when you have booked 1000?

If that’s permanent, not really. There is the option to measure it via an app from the BnetzA (broadband measurement), and if the average is too low, I think you can reduce the price until the provider improves it. At least you can report it to the BnetzA.

So far, they have disappointed us. We contacted them because since May 22 (I think) we have a legal right to broadband internet (at least 10mbit). Since our provider didn’t want to connect us in the transitional apartment because the KVZ is full, and they have a monopoly here, we reported it to the BnetzA. Legally, they have to provide us with service.
The BnetzA then opened a case, forwarded it to the provider, who then opened a support ticket. Then nothing happened for months, until I eventually received an email from the provider—with the same content as before: They can’t connect us, the KVZ is full, and a technical expansion would be uneconomical. Shortly afterward, I received an email from the BnetzA, repeating the content of the provider’s email.
Great, that really helped me a lot.

Of course you need the router. But guess how many people have zero clue about the subject and simply unplug the old-school cheap router from the apartment?

Oh, the LAN sockets make a huge difference! They separate the heavy traffic of the immobile consumers from the mobile ones, plus LAN is usually faster and more stable. Thus, the processing is faster. Sure, if the total connection is maxed out, the division won’t help anymore. But with a 100 Mbps connection, you really have to try hard to max it out or have several gaming teens.

Before I would start pulling any cables and installing sockets, I would always first go for Wi-Fi and buy an appropriate router that can handle the bandwidth. Time required: 10 minutes, cost: 200 euros.

By the way, is 665 mbps acceptable when you have booked 1000?

Where are the 665 measured? At the router or at the end device?

Before I would start pulling any cables and installing sockets, I would always first go for WLAN and buy an appropriate router that can handle the bandwidth. Time required: 10 minutes, cost: 200 euros.

Every router should handle the bandwidth, unless you live in a palace and the bath is 50 meters wide.

Where are the 665 located? At the router or at the end device?

At the end device (connected via LAN)
Funny, I just downloaded the BNetzA Desktop App and the very first measurement was 800. Could it be that Vodafone knows the corresponding servers and allows more bandwidth there? Slot then fewer people could open a procedure?
Now I’m doing a series of measurements on three different days spaced apart, 10 measurements spread over the day, let’s see.

The relevant speed test for me is Steam. That's where I notice most if something is clogging the connection. According to Steam, my contract is fulfilled at 110%. wieistmeineip, fast.com etc. all provide me with roughly different values. I am too unwilling to install a program like the one from the Federal Network Agency.