Slow Fiber Broadband WiFi Speed Improved By Removing USB Hub

"Disabling the Mac Mini's Bluetooth improved its WiFi download speed to the mid-300Mbps range. Bluetooth and WiFi has always been problematic with this Mini; fortunately, I have no need for Bluetooth while using it."

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Troubleshooting Mac WiFi and Bluetooth:

A. Troubleshooting Mac WiFi:

A few thoughts to try...

I. Clear the Temporary Internet Files:

• Cookies perform remembrance of certain site-entered data.
• Cache keeps a snapshot of the last time you visited a site.
• Go Here: Clear your browsing history in Safari on Mac - Apple Support

II. Restart your Router:

1. Power: off the router
2. Wait: 30 seconds
3. Power: It back on

III. Boot in Safe Mode:

In Safe Mode, Login Items do not run at login, certain preferences are set aside, and damaged system files are then reset. So, once booted in to Safe Mode, wait 30 seconds, and then boot up normally, attempting another update install. For instructions, go here: How to Use safe Mode on your Mac - Apple Support

B. Troubleshooting Bluetooth Connectivity:

A few thoughts to try...

I. Go Here: Connect a Bluetooth Device with your Mac - Apple Support

II. Bluetooth: If a Bluetooth headset doesn’t work with Mac - Apple Support

III. USB Dongles:

Use the MacBook Pro's builtin Bluetooth adapter (Not a USB Bluetooth Dongle), You would only need to connect it once with the MacBook Pro. When you no longer need to use it, just delete it from the list of devices.

"Slow Fiber Broadband WiFi Speed Improved By Removing USB Hub: [...]Thanks to the info at the now-closed forum discussion at Mac Mini Slow Internet RESOLVED! - Apple Community , I removed a Sabrent USB hub from the vicinity of the Mac Mini and the Mini's WiFi download speed has doubled.[...]"

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Amplifying the Signal:

You'll need to boost the signal with a range extender, or connect it to your router, using Ethernet. If you don't have Ethernet, then this is the adapter to get: Belkin USB-C to 2.5Gb Ethernet Adapter - Apple

Those are a good starting points.

What router is Hunter using and how far away is the Mac mini from that router.

If the 2018 Mac mini sees a 2.4GHz and 5GHz band coming from the router, test the speed of both.

Maybe check with Hunter to see if they can supply a Mesh setup or an Extender that is closer to the Mac mini.

https://hunterfiber.com/help-videos/