Almost 11 Mbit / s despite 50k line. Why / what can I do?

Mo
2

Hi, I live in Berlin and have a DSL contract with up to 50 mbit / s at o2. I have the problem that I only get 11 mbit / s on my cell phone on speedtest.net (even if I'm only a few centimeters away). In general, the Internet is slow in the entire apartment, regardless of whether it is a PC, laptop or mobile phone. There are also not very many devices connected to the Internet. I don't have a bad router either (have a Fritzbox 7590). In addition, there are several internet crashes every day, even though I changed the DSL cable several times. So what's the problem with my internet running so badly? Is it the router or the provider? And what are the proposed solutions?

Ve

Get you a 200k line xD

Re

The number of simultaneous users reduces the actual speed.