No, it shouldn't be that slow either way. The reason I asked about the 10Gb Ethernet is that there are some other threads of people having issues using their 10Gbps Ethernet ports over 1Gbps link speed networks, and getting a lot lower speeds than they should be getting.
I have seen enough posts on it that it has deterred me from getting the upgrade on a new M2 Pro Mac Mini that I will be getting soon once I determine which configuration I need. I was only going to get the 10Gb Ethernet upgrade for future proofing, as my current network of many 6 Gen AirPort Extremes has been excellent, but I may replace it in the next few years.
Since I do not need it, there is no point on getting the 10 Gb Ethernet if it may only cause me problems.
But, that is obviously not your problem.
I am unsure of what you are expecting, but those speeds are very good. Although, it doesn't match with your experience with trying to download.
How does the Speedtest results compare with wireless?
Is this with a particular website, or any website?
Do you have any firewall or proxy settings enabled?