Something strange with the speed

Although my ethernet has a Gigabit network card(RTL8111)，the speed shouldn't be near 1000mbps as below because my broadband service is 300 Mbps.
It looks like speedtest for LAN

<img width="1076" height="622" alt="Image" src="https://github.com/user-attachments/assets/06d126fc-dd4c-4547-9a62-492984455f3a" />