How to Fix Slow Wi-Fi Connection on MacOS Sierra?

by Linas Kiguolis - -
12

Question

Issue: How to Fix Slow Wi-Fi Connection on MacOS Sierra?

I’ve noticed that Wi-Fi speed after upgrading from elCapitan to Sierra decreased significantly. Sometimes the connection is lost and then established again.  Such things did not happen earlier, so I’m interested if it’s just a coincidence or it’s a problem of Sierra?

Solved Answer

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Slow Wi-Fi Connection is a common problem for MacOS Sierra users. While such issue may occur for other Mac OS versions, many people have started posting complaints about a decreased Wi-Fi speed soon after the release of MacOS Sierra upgrade 10.12. If you are encountering this issue, try to check if there are no problems with the router. If there are not damage or changes related to the router, then it might be that MacOS Sierra 10.12 update modified some Wi-Fi settings due to which the speed might have decreased. According to the latest reports, Mac OS Sierra users are facing such Wi-Fi network problems:

  • Mac disconnects from the Wi-Fi after waking it up from sleep;
  • Mac randomly disconnects from Wi-Fi;
  • Wi-Fi connection is slow;

NOTE: before performing any slow Wi-Fi connection fixes, it’s advisable to backup you Mac using Time Machine. If you’re ready, try to perform the following troubleshooting steps:

Method 1. Delete Wi-Fi preferences

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  1. Disable all running applications that are using Wi-Fi (e.g. web browsers, Skype, etc.).
  2. Turn off WI-Fi. For this purpose, click Wi-Fi menu bar and select Turn Wi-Fi Off.
  3. Launch Finder and click Command + Shift + Go to open Go To Folder.
  4. Enter the following path into the new window: /Library/Preferences/SystemConfiguration/.
  5. Find the files listed below and select them:
    com.apple.airport.preferences.plist
    com.apple.network.eapolclient.configuration.plist
    com.apple.wifi.message-tracer.plist
    NetworkInterfaces.plist
    preferences.plist
  6. Remove those files by dragging them to Trash (but don’t empty the Trash to keep the backups of those files temporarily).
  7. Once matching Wi-Fi configuration files are deleted, restart your Mac.
  8. When the system boots up, click on Wi-Fi menu bar, and select Turn Wi-Fi On.

Method 2. Reset Network Location with Custom MTU and DNS

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  1. Go to the System Preferences and select Network.
  2. Select Wi-Fi using the left pane.
  3. Open Location menu and opt for Edit Locations.
  4. Click on the + sign to create a new network location and name, for example, Wi-Fi error Fix.
  5. Open the drop-down menu of Network Name and click on Wi-Fi network you want to connect to.
  6. Select Advanced on the Network panel and open TCP/ IP tab.
  7. Select Renew DHCP Lease.
  8. Open DNS tab under DNS Servers and click + button.
  9. Add each IP onto its own entry: 8.8.8.8 and 8.8.4.4 (Google Public DNS servers).
  10. Select Hardware and set Configure to Manually.
  11. Adjust MTU to Custom and number it to 1453.
  12. Click OK and Apply to save the changes.

Once done, we would recommend scanning the system with  MacKeeper in order to check if all Mac OS X system files and apps are functioning properly. Hopefully, these steps have helped you to fix Wi-Fi Connection Problems on MacOS Sierra. If not, please let us know, so that we could further investigate the issue.

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About the author

Linas Kiguolis
Linas Kiguolis - IT professional

Linas Kiguolis is a qualified IT expert that loves sharing his excellent knowledge about problems in Windows and Mac operating systems. Linas’ insights often help other team members find quick solutions for visitors of UGetFix site.

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