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How to Fix Slow Wi-Fi in Mac OS X Mavericks (10.9)

Lately I had a couple friends who just picked up some new 2013 27-inch iMac desktops and upon setting up their machines—they noticed incredibly slow 802.11ac Wi-Fi internet connectivity, despite their iOS devices at home on the same network having no issues with Apple’s latest Airport Extreme.

After some research online, it appears the problem of slow Wi-Fi on your Mac within OS X Mavericks is a widespread problem, given the numerous and lengthy threads within the Apple Support Communities forums.

After troubleshooting solutions to fix my friend’s Wi-Fi (changing router channels; hard resets; Shaw cable modem resets, etc)—one solution in this thread ended up working right away: deleting your home network’s SSID and then re-adding it.

Immediately, Speedtest.net tests showed an instant fix as his Shaw 25 plan resulted in download speeds of 22 Mbps, compared to just 6 Mbps down prior to deleting the WiFi network!

Here’s how to fix your slow WiFi connection via the method mentioned above:

1. Go to Apple > System Preferences > Network

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2. Click on ‘Advanced’, then turn your Wi-Fi off.

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3. Find your existing network name in the list of preferred networks, then click the “—“ button to delete it. Click “+” and re-add it. Click ‘OK’ when done, then click ‘Apply’.

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4. Turn WiFi back on (you should automatically connect to your network) and/or reboot your mac.

Once that’s done, your WiFi should be significantly improved, but your mileage may vary. Interestingly enough, this fix unfortunately did not work on his 2009 21.5-inch iMac running OS X Mavericks.

One More Solution to Fix your Slow WiFi on your Mac

One other solution which has worked to help fix the Wi-Fi speeds of my 2012 MacBook Air was to disable Bluetooth, as crazy as it sounds. Doing that just worked and allowed my down speeds to go back to ‘normal’ in OS X Mavericks.

Let us know if any of the solutions above help fix your slow Wi-Fi issues on your Mac in OS X Mavericks. Slow Wi-Fi is definitely a #firstworldproblem that is excruciatingly painful and frustrating. Let’s hope a future Mavericks update will addresses these Wi-Fi issues.

Founder and Editor-in-Chief of iPhoneinCanada.ca. Follow me on Twitter, and @iPhoneinCanada, and on Google+.

  • erth

    i had this problem with my imac 27″ and i believe i stopped safari (not just closed it, but stopped it from the menu bar). it has worked fine after that.

  • Joker Eh

    if you are using an Airport Extreme and have not bridged the modem/router you are wasting your time in trying to fix the issue. When you bridge the modem/router you turn it just to a modem. Turning off Wifi on the modem/router does nothing except turn off wifi.

  • jabohn

    I have the 2013 27 inch iMac and haven’t seen any speed issues whatsoever.

  • Unni

    fixed my issue @ office.. thanks buddy

  • Osprey

    Deleting and adding my network worked. Turning off Bluetooth kept me from typing in blocks like this one.

  • Rob

    None of this worked for me, on a 2011 iMac. Problem even occurs after a totally clean reinstall of Mavericks. Lousy throughput on wifi, to the point of it being unusable. After spending some time testing, here’s what is happening in my case : when the iMac wifi adapter is switched on, all other wifi-connected devices on the network suffer the same issue (even non-Apple devices). With the iMac wifi adapter switched off, it all goes away :) Everything works. So, I would conjecture that actually, the Mavericks wifi stack is making the WLAN adapter dump ‘garbage’ of some description onto the wireless LAN that is upsetting things all around.

    Wiping again, and going back to Mountain Lion, where I shall stay!

  • Qmk77

    I am about to throw my Mac in rubbish bin!! Nothing works!

  • wazel

    Im having these issues w/ a late 2013 rMBP.. Also my first Apple product…

  • Jimmy D

    Since updating my MBAir to Mavericks, turning Bluetooth on kills my WiFi. Its like its forgotten my home network every time the system sleeps and then takes a couple minutes to reconnect each time. Deleting and re-adding the network in System Settings didn’t help.

  • anton

    worked!

  • http://www.iphoneincanada.ca/ Gary

    Awesome :)

  • Galen Moore

    Nope, nothing. Thanks for the detailed post, but this just didn’t work on my 2012 Macbook Air.

  • Glenn

    That was brilliant! Deleting and adding my network was just the ticket to fix my slow internet connection. Thank you.

  • Allison

    Thank you so much! The bluetooth worked for me! Nothing else worked…I even took it to the apple store

  • Zack Bloom

    Do you have a Bluetooth keyboard?

  • Mitch Butin

    YES! It worked, thank you!

  • http://www.iphoneincanada.ca/ Gary

    Nice!