Hi,@JayinNZ 

Thank you for posting your query on our commercial forum.

Please refer to the following troubleshooting steps:
1.Please replace the Ethernet cable connecting your two switches with a shorter one
2.Kindly ensure that you are using a Cat5E or higher-rated Ethernet cable
3.Please connect your computer directly to the affected port via a wired connection, and run a speed test to check whether the actual speed you get is close to 1Gbps
4.Please test with another available port on the switch to see if you notice any improvement in speed.

If the issue still persists after trying all of the steps above, we will need you to provide the following information to help us further diagnose your problem:
1.A full description or diagram of your complete network topology
2.The maximum internet speed provided by your Internet Service Provider
3.The speed test result when your computer is connected directly to the relevant switch port.
Thank you very much for your cooperation.