PS4 improve connection speed?

I have an incredibly annoying problem with my PS4, which makes it almost impossible for me to gamble online.

My download speed is just 1.5 Mbps, despite a 100th line.

My Lankabel does not improve it.

On all other devices are the full 100, only on the PlayStation not.

What can it be and what can I do about it?

Position the ps4 in a different position.

If that does not work, try youtube.

The position of the PS4 should actually be completely irrelevant with LAN connection.

In the router config open all the porta that wants the PS4. Which ones are you can find online.

Cable changed? Connection changed? WLAN tried?

Then the cable is broken bz very weak