Which speed test did you use and does it go over 200Mbit/s?
The best result is with the installed variant of CNLAB.
https://www.cnlab.ch/speedtest?noanalytics=&cHash=10e05733673fb3ad9f63ab9684e39a4e
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.