How to Fix Slow Wi-Fi issue on macOS Mojave

How to Fix Slow Wi-Fi issue on macOS Mojave

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Overview: With the installation of macOS Mojave users are facing multiple issues. Today in this post we will troubleshoot slow Wifi issue and will improve the speed of WiFi on macOS Mojave.

So, let’s start with a real user’s practical scenarios!

Scenario 1: Wifi speed slow on iMac but fast on iPad

My 2010 iMac running 10.10.5 has been getting very slow download speeds from my AT&T provider’s modem. Speed tests show download speeds at 2.97 Mbps while my iPad 3 running system 9 is showing 5.92 Mbps right next to the iMac. I used to get faster download speeds on the iMac after a reboot. However, recently that hasn’t made any difference.  Does anyone have any idea what is going on with the iMac? Thanks in advance

Source: Apple Forum

Scenario 2: Wifi internet really slow only on iMac

I’ve had this problem for a while and my iMac has been in 2 different locations in my house. The internet speed is really slow – 1mbps at best, even though the signal bar is showing full! If I put my iPhone, iPad or MacBook in the same place I get 40+mbps!! So for some reason, my iMac is running so much slower than all other Apple products and virtually unusable. Has anyone got any idea what is causing this and how i can finally solve this annoying and frustrating problem?

Source: Apple Forum

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Remove Proxies

  • Go to the Apple Menu
  • Select System Preferences
  • Click on  Network and then click on Advanced
  • Now select Proxies
  • Now uncheck all the box under Select a protocol to configure.
  • Hit OK then Apply and restart your Mac

Reset Wi-Fi Network to Default

  • First, turn off the WiFi.
  • Go to Finder on your Mac, select GO and then select Go to Folder and type the below path

           /Library/Preferences/SystemConfiguration and hit Go

  • Now rename  preferences.plist  to  preferences.plist.bak

Now reboot your Mac and check the WiFi speed.

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Get Rid of Current Wi-Fi Preferences

Make sure you back up your Mac before following the steps

  • Turn off the Wi-Fi
  • Open Go folder and select Go to folder.
  • Type in this path /Library/Preferences/SystemConfiguration/ and hit Go
  • Select the files provided below.






  • Delete all the Network files you see, you can simply move them to the trash. In case, you want to keep them then keep in a separate folder

Restart your Mac, turn on the Wi-Fi and check the speed.

Reset SMC

  • Go to the Apple menu and shut down your Mac.
  • Once Mac shuts down, press and hold the Shift-Control-Option on the left side of the built-in keyboard, then press the power button together. Hold these keys and the power button for 10-15 seconds.
  • Now Release all keys.
  • Press the power button again to turn on your Mac.

For Mac desktop computers

  • Go to the Apple menu and shut down your Mac.
  • Unplug the power cable.
  • Wait 15-20 seconds.
  • Plug in the power cable back.
  • Wait for 10 seconds and start your Mac.

Now Check the WiFi speed.

Reset PRAM and NVRAM

  • Shut down Mac
  • After few seconds start the Mac and press and hold Option, Command, P and R keys on the keyboard together.
  • Hold the keys down till the Mac reboots and you hear a beeping sound.

Start Mac in Safe Mode and Check the WiFi speed

  • Press and hold the power button to shut down your Mac.
  • Now start your Mac and immediately Press and hold the Shift key as soon as the start-up sound is heard.
  • Release the Shift key when you see the Apple logo. Safe Boot appears on the macOS Mojave start-up screen.

Safe Mode restricts the use of many applications on the system and allows examination in a more restricted environment. In case the Wi-Fi speed is fine in Safe Mode then you have to isolate the software which is causing no boot issue.

Create Another Account on Mac

  • Go to the Apple menu, select System Preferences and then click on Users & Groups.

Users and group


  • Click on the lock icon to unlock it, put your administrator name and password.

Click on the lock Icon Mac

  • Now click on Add or Plus icon to create new account

Click on the plus icon

  • Click the New Account pop-up menu and then choose a type of user i.e. Administrator or Standard user and put all the necessary details and Click on Create User.

Admin account

Now check the Wi-Fi speed, in case, Wi-Fi speed is fine then old profile may have gone corrupt. Transfer all the data to the new account and start using your Mac.

Perform Clean Installation of macOS Mojave from USB flash drive

In case none of the steps works then performing a clean installation should help you to fix slow Wi-Fi. Please note that you will lose all your data on the Mac. Visit this link to perform the clean installation: Apple link How to create a bootable installer for macOS

Wrap Things Up

I hope this article helped you to fix the slow Wi-Fi issue with macOS Mojave.

Also, Fix macOS Mojave Common Issues and Fixes

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