Ethernet slower than Wifi on a Mac Mini M4

“Ethernet slower than Wifi on a Mac Mini M4: I'm wondering why a direct ethernet connection to an 8 port switch would be slower than a wireless connection through a modem which is connected via ethernet to the same switch.”

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Slow Ethernet Vs. Fast WiFi:

So, what’s the DTR (Data Transfer Rate) of the switch? If you’re using internal LAN services, with a slow switch, then expect slower speed.

IMPORTANT: Keep personal information off of these forums. These are out there for everyone to view. So, for your Security & Privacy, I’ve requested the Serial Number be removed from your screenshot.

You are going to have to tell us all the details of your setup ... specific device models of the switch, modem, router (if one), wifi access device (if one), specific cables & their specs, etc. Plus a diagram of how you have them connected. And how you 'know' the speed is slower on the wired ethernet connection. Otherwise we're just guessing.

Remember, the Mac is does not innately understand what you are trying to do.

When you plug in an Ethernet cable, packets going to the Internet CONTINUE to be sent to the TOPMOST, working interface shown in the Network pane. If TOPMOST is Wi-Fi, then you just did two tests of the same interface.

Best practice is to set Ethernet TOPMOST, and then when the cable is unplugged, Ethernet will not also be Working, so your Mac will use Wi-Fi instead.

Make sure the ethernet cable between your Mini and the switch is a Cat 6 or greater and that the switch (as the Littles suggested) is capable of the higher speeds you expect.