How to Fix Slow Wi-Fi after MAC OS Sierra upgrade

With new things sometimes there are new problems that tend to drive a punch in the face while enjoying a new package like MAC OS Sierra Upgrade. With smart top features like Auto-Unlock and Universal Clipboard, the MAC OS Sierra Upgrade is undoubtedly one of the best upgrades to the Mac OS. Well, it is difficult to not love such a beauty for its top-class features and improved interface. However, it has been discovered that MacBook tends to make the speed of your wireless router unnecessarily slow. Also, the mobile hotspot or public Wi-Fi network keeps disconnecting at unspecific and continuous intervals. This problem has also been discovered to occur after a successful upgrade to the MAC OS Sierra. This leads us to the need to know how to fix slow Wi-Fi after MAC OS Sierra Upgrade. We shall be looking into a number of ways to deal with and conquer this recurring problem.

Solution 1: Reset Wi-Fi Router and restart Mac Wi-Fi connection

One of the first solution to Fix slow Mac Wi-Fi is to first restart your Mac’s Wi-Fi connection. This can be easily done by disconnecting it from the wireless network.

To do this, click on Wi-Fi menu bar > select Turn Wi-Fi Off >Turn off Bluetooth adapters on your MacBook> Restart your MacBook and try to reconnect.

If the problem remains unsolved, you should consider either rebooting or resetting your W-Fi router. This is because though the Slow Wi-Fi on Mac has been pinned to occur after an upgrade to Sierra OS, it does not necessarily mean that it would be the sole cause of a slow Wi-Fi. The fault might also be from the Wireless router supplying internet access. Hence, it is advisable to first reboot your router by simply unplugging the adapter for a few minutes and plug it back. If the problem persists, you can then opt to reset your Router by locating a red “reset” button usually located at the rear end of the router and pushing the button.

Note:By resetting your router, your router’s password and network name would be restored to default. Therefore, you have to change the password and broadcast network name again to your desired combinations.

Solution 2. Remove Existing Wi-Fi Preferences in MAC OS Sierra

Another way to fix slow Mac Wi-Fi is to delete or remove the previously existing Wi-Fi preferences in the MAC OS Sierra. This method requires maximum attention to executing successfully, therefore, follow this steps carefully

  1. First of all, disconnect all applications that could be making use of the Wi-Fi network
  2. Turn off your Wi-Fi adapter
  3. Now, on your MacBook desktop, create a new folder to save the backup and name it “Preferences Backup” or any other desired name of your choice
  4. Click on the “Finder” icon and select “Go to Folder” or simply press the shortcut keys Command+Shift+G on your keyboard
  5. Fix Slow Wi-Fi after MAC OS Sierra upgrade-1

  6. On the pop-up window, carefully enter this folder path /Library/Preferences/SystemConfiguration/and then hit enter on your keyboard or click “Go”
  7. Fix Slow Wi-Fi after MAC OS Sierra upgrade-2

  8. Now copy everything in that folder to the backup folder you initially created on your desktop. This is to back it up in case anything goes wrong.
  9. Now locate these five files below in the folder to be deleted:
  10. - - - - NetworkInterfaces.plist - preferences.plist

    Fix Slow Wi-Fi after MAC OS Sierra upgrade-3

  11. You can now delete the matching files with the list above
  12. Now reboot your Mac and turn on Wi-Fi to check if it now works perfectly

Solution 3: Reset Network to Default

How to Fix Slow Wi-Fi after MAC OS Sierra upgrade could also reset the network on the MacBook to default. This can help fix Slow Mac Wi-Fi. To reset Network, follow this simple steps:

  1. First turn off your MacBook’s Wi-Fi connection and disconnect from all previously established wireless connection
  2. Click on the Finder icon on your MAC OS Sierra
  3. Then Click on “Go the Folder” and type this folder path /Library/Preferences/SystemConfiguration
  4. Fix Slow Wi-Fi after MAC OS Sierra upgrade-4

  5. Now you have to search and locate a file with the name preferences.plist
  6. After locating the file, you need to rename it
  7. - preferences.plist.bak

    Fix Slow Wi-Fi after MAC OS Sierra upgrade-5

  8. After renaming the file, close the folder and reboot your Mac.
  9. Now turn on your Wi-Fi back and try to reconnect
  10. If you check he previous folder again, you will see that a new preferences.plist has been created and network has been successfully restored to default factory settings.
  11. You should now be able to enjoy seamless Wi-Fi connection.

Solution 4. Remove existing Wi-Fi preferences

If all efforts to curb this nightmare of a problem proves abortive, there is still another trick in the book to be played to fix slow Mac Wi-Fi. This involves heading to the preference settings of the system.

  1. Click on “System preferences” from the Mac Menu ;
  2. Fix Slow Wi-Fi after MAC OS Sierra upgrade-6

  3. Among the System preference icons, locate and select the “Network” Icon;
  4. Fix Slow Wi-Fi after MAC OS Sierra upgrade-7

  5. On the left side pane, select the network you wish to connect to;
  6. At the top of the page, under the “Location” drop down menu, select “Edit Location”;
  7. Fix Slow Wi-Fi after MAC OS Sierra upgrade-8

  8. On the new window, click on the plus (+) sign to create a new location ;
  9. Add a suitable Wi-Fi network name and click on Done
  10. Fix Slow Wi-Fi after MAC OS Sierra upgrade-9

  11. You can now join the Network under network name and type in the password of the network as usual;
  12. Now click on the Advanced option and select the TCP/IP tab;
  13. Click on the Renew “DCPH Lease” button and tap Apply when done;
  14. Now on the Network Screen, click on the DNS button;
  15. On the DNS servers Column, click on the plus (+) button below;
  16. You can now add OpenDNS ( and or Google DNS ( and;
  17. Fix Slow Wi-Fi after MAC OS Sierra upgrade-10

  18. You may now click on the “Hardware” tab;
  19. Change the Configure option to manually;
  20. Change MTU option to custom and edit the number to be 1453;
  21. You may now click OK at the button of the window to complete the setup and finish creating a Wi-Fi network.


One might have to try more than one solution on How to Fix Slow Wi-Fi after MAC OS Sierra upgrade until you are able to successfully fix the issue. The fact remains that the MAC OS Sierra Upgrade is a master piece of Apples OS upgrade that has its perks and bugs just like any other software. Just patiently go through the steps in this article and you would be able to fix slow Mac Wi-Fi.

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