How to Fix Slow Performance Issue on macOS Mojave



Overview: There are many users who are facing slow performance issue after installing macOS Mojave. Today in this post we will troubleshoot slow performance issue and will speed up the performance on macOS Mojave.

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

Scenario 1: After Upgrade to Mojave Very Slow Login

Good morning! I own several Macs, all show the same issue after upgrading to Mojave. The start-up time till the login screen is faster now. After typing my password in, it is getting really slow. After a while, a white apple logo is showing up for a few seconds. After that, the login is successful and the Mac is working very well as usual. Anybody else has this problem? Is a massive longer waiting time “works as designed”? Thanks!

Source: Apple Forum

Scenario 2: After Upgrade to Mojave Very Slow Login

It’s not just the login that is suffering, everything is extremely slow. It’s like I added 10 years to the age of my iMac with this upgrade. Everything gets a spinning cursor: Dropbox, Chrome, even Mac’s own System Preferences hangs on me. CPU usage is normal, memory is available, there seems to be no hardware reason for this. And obviously not, as it began with the OS upgrade. I have an iMac Late 2015 5K. This shouldn’t be happening.

Source: Apple Forum

Like the above two users there are multiple Mojave users who are facing this issue, let’s go ahead and fix this.

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Solution 1: Run Hardware Test

A bad hard drive or any bad hardware component may slow down your Mac or may even result in complete failure.

To run Apple Diagnostic unplug all external devices except mouse, keyboard, monitor in case of desktop, ethernet cable and power cable.

Shut down your Mac.

Start your Mac and immediately press and hold the D key on the keyboard. Keep holding the D key till screen prompts to choose your language. Once you select a language, it will start the diagnostic, it may take 2 to 3 minutes. In case of any hardware failure, it will produce reference code. To see the list of reference code visit this link and contact Apple Support in case you receive any hardware failure code.

Solution 2: Disable Startup Apps

Go to Apple Menu, select System Preferences

Click on Users & Groups and to Login Items. Here you will all the startup items. The apps which you don’t need, remove them by clicking on the name of the startup item and then click the minus button. Make sure you do not remove any important system apps.

Solution 3: Disable Power Hungry Apps

Go to Applications and click on Utilities.

Double Click on Activity Monitor.

To find apps which are taking a lot of space, click on the CPU.

Check for the apps which are taking most of the CPU space in the CPU column list and close those apps, to close apps click on the X on the top left corner.

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Solution 4: Update Apps

Many older apps are not compatible with macOS Mojave. Get rid of those apps and install updates for the apps which are compatible. Updating apps may fasten performance.

Go to system preferences then click on Software Update. Click on Update Now option.

Solution 5: Free up Disk Space

Clear the cache files

Launch Finder and select Go to Folder and select Go.

Type in ~/Library/Caches and click Go.

Go into each of the folders and delete everything.

Keep the folders, but go into each one and delete the files inside

Now repeat the process but replace ~/Library/Caches with /Library/Caches

After this do not forget to empty the Trash.

Delete old iOS and iTunes backups which you do not need.

Uninstall the apps you no longer require

Clean up your desktop

Solution 6: Utilize optimize Storage Option

To use optimize Storage Option, go to Apple menu and click on About this Mac

Go to Storage and click on Manage. You might notice to store in iCloud, optimize Storage, and Reduce Clutter. Here, click on Optimize.

Solution 7: Buy Solid State Drive (SSD)

In case you have an older hard drive installed on your Mac then its time to replace HDD with SSD. SSD drives are very fast and will definitely improve performance.

Solution 8: Reset SMC and NVRAM/PRAM

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.


  • Shut down your 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.

You will not lose any data with these reset so do not worry about it.

Solution 9: Start Mac in Safe Mode and Check The Performance

  • 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 performance is good in Safe Mode then you have to isolate the software which is causing a performance issue on Mac and get rid of them.

Solution 10: 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 performance, in case, performance is good then old profile may have gone corrupt. Transfer all the data to the new account and start using your Mac.

Solution 11: Perform Clean Installation of macOS Mojave from USB flash drive

In case none of these steps works then performing a clean installation may help you to fix slow performance. 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 performance issue on macOS Mojave.

Also, Fix macOS Mojave Common Issues and Fixes

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