Modern Mac users have several options for connecting to a network or Internet, including Wi-Fi and Ethernet. However, if you are not careful, you may not be using the connection you suspect you have. But do not worry, we are here to help you.
Apple may systematically remove ports from its computers, but if you own one of the company's desktop Macs or live in Dongle Town, you probably have several different network connections available at all times. If maximum throughput is your goal, connect via an Ethernet cable. However, it's important to keep Wi-Fi active for some of Apple's fancier features, such as unlocking your Mac with an Apple Watch, and more.
You probably need to leave Wi-Fi turned on, which can cause a problem ̵
This is not ideal for obvious reasons. Anyone who uses Network Attached Storage extensively or just has a superfast Internet connection needs to use the fastest available connection. Thankfully, macOS makes it easy to change the priority of connections. To verify that Ethernet is at the top of the list:
Changing the Order of Network Connections
Click the Apple menu to launch it and select System Preferences.
 Then click "Network" to open the network-specific settings area.
Allows you to make changes to all elements of your computer's network connection, including the order in which the different connection methods are displayed.
Click the gear icon at the bottom of the window, and then choose Set Service Order.
The resulting window displays all available network connection types or services for you. Hopefully, Ethernet is high on the list. However, if you use a dongle, this name is different. Do not worry; It is immediately apparent which entry is the dongle due to its name. Look for something that mentions either "Ethernet" or "1000BASE-T".
Drag any service to the desired location in the list. If you want the Ethernet service to be at the top of the list, click OK. Then click on "OK".
Then click on the "Apply" button to confirm the changes.