11 Reasons Why Is My Mac So Slow All Of A Sudden
Published 26/04/2023
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Do you constantly ask yourself this question: Why is my Mac so slow all of a sudden? Know why you face this issue even if you have plenty of storage.
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Do you constantly ask yourself questions like these? Why is my Mac so slow all of a sudden? Or why is my Mac slow so slow when I have plenty of storage?

Well, you’re not alone. Are you a proud Mac user who has been feeling frustrated lately due to a slow-performing machine?

Do you find yourself waiting impatiently for applications to load, experiencing frequent lags, and struggling with a decrease in overall performance? Many Mac users encounter this issue at some point, and it can be a real productivity killer.

But fear not! In this blog, we’ll explore some creative tips to help you revive your slow Mac and get it running smoothly again, so you can get back to being productive and enjoying the seamless Mac experience you love.

Top Reasons Why Your Mac Is So Slow All Of A Sudden?

Reason #1 Low Storage Space 

If your device is running out of storage space then it may considerably degrade your Mac’s speed and performance. Hence, ensuring sufficient drive space is essential for maintaining optimal performance on your Mac. When your system approaches its maximum storage capacity, it can become sluggish.


To check the available storage space on your Mac, follow these simple steps:

  • Click on the Apple icon located in the top left corner of your screen.
  • Select “About This Mac” from the drop-down menu.
  • In the window that opens, click on the “Storage” tab.
  • To free up space on your drive, click on the “Manage” button.

By regularly monitoring and managing your Mac’s storage space, you can ensure smooth and efficient performance for your system.

In addition to checking your Mac’s storage space, it’s also wise to consider moving your files to an external hard drive as an extra layer of protection. Despite popular belief, Macs are not immune to malware attacks.

By keeping your important files stored safely on an external hard drive, you can minimize the risk of losing them in case your Mac gets infected with malware. It’s a proactive measure to safeguard your valuable data and ensure its security.

Wondering Why Your Mac Is Slow Even Though You Have Plenty Of Storage? Read the next Reasons-

Reason #2 Large Number of Cache and Log Files

As you perform tasks on your computer, temporary files known as cache are created and stored to expedite web page loading and enhance app performance.

To avoid potential slowdowns on your Mac, it’s crucial to regularly clear your caches. By doing so, you can ensure that your system functions efficiently without unnecessary storage burdens. Keeping your caches in check is a proactive measure to maintain optimal performance on your Mac and prevent it from running slowly.


To clear cache files on a Mac, follow these steps:

  • Open Finder and click on the “Go” menu in the top menu bar.
  • Hold down the “Option” key on your keyboard to reveal the “Library” option, and click on it.
  • Within the Library folder, navigate to the “Caches” directory.
  • Here, you will find various folders corresponding to different apps and services that store cache files. You can either delete specific folders or delete all the contents within the “Caches” folder.

large number of cache filesImage source: AVG

  • To delete cache files, simply drag the folders or files to the Trash or right-click and select “Move to Trash.”
  • Empty the Trash to permanently delete the cache files from your Mac.

Also Read: Macbook Pro Running Very Slow And Freezing: Top 5 Fixes

Reason #3 Many Unwanted Extensions

Yes, unwanted extensions can potentially slow down a Mac all of a sudden. Extensions are add-ons or plugins that can be installed on web browsers or other applications to add functionality.

However, some extensions may consume system resources, such as CPU, memory, or network bandwidth, which can lead to a decrease in performance and slow down your Mac.


To remove unwanted extensions on a Mac:

  • Open the web browser or application where the extension is installed.
  • Go to the browser’s Extensions or Add-ons settings, usually accessible through the browser’s menu or settings options.
  • Locate the unwanted extension in the list of installed extensions.

unwanted extensions in MacImage source: All Things How

  • Click on the “Remove” or “Delete” button next to the extension to uninstall it.
  • Follow any additional prompts or instructions to confirm the removal of the extension.

Reason #4 Presence of Viruses or Malware

Certain types of malware are specifically designed to intentionally slow down Macs, while others indirectly affect system performance by consuming resources and disrupting processes.

It’s essential to be proactive in protecting your Mac by using reliable antivirus software, being cautious with downloads and email attachments, and avoiding suspicious websites.


Download and install a trusted antivirus software specifically designed for Mac, and regularly update it. Run a full system scan to detect and remove any potential malware.

presence of malware on MacImage source: MacPaw

Also, Macs have built-in security features such as Gatekeeper, XProtect, and Malware Removal Tool, which help detect and remove known malware. Keep your macOS and security features up to date to ensure maximum protection.

Reason #5 Redundant Startup Items

Macs automatically launch apps when you log in, which can slow down your Mac computer if there are too many. By managing your login items, you can control which apps start automatically and potentially improve the performance of your Mac.


To manage login items on your Mac, follow these quick steps.

  • Go to System Preferences from the Apple menu.
  • Click on Users & Groups.
  • Select your user account.
  • Go to the Login Items tab.redundant startup items on Mac
  • Uncheck apps that you don’t want to auto-launch upon login.

Also Read: How To Find The Largest Files On Mac – Top 5 Ways

Reason #6 Corrupted SSD or HDD

When you think about why is my Mac so slow all of a sudden, this reason should definitely cross your mind. So, yes, a corrupted HDD (hard disk drive) or SSD (solid-state drive) can potentially slow down a Mac. When a storage drive becomes corrupted, it may result in errors, data loss, and degraded performance.

corrupted SSD or HDD slowing down macImage source: Apple Support


It’s important to regularly monitor the health of your HDD or SSD and address any corruption or errors promptly. This may involve running disk utility tools, repairing disk permissions, or even replacing the drive if necessary to maintain optimal performance on your Mac.

Reason #7 Outdated Mac

Using an outdated macOS version can potentially slow down a Mac even when you have plenty of storage space. This is because older macOS versions may lack performance optimizations, bug fixes, and security updates that are available in newer versions.

Over time, as software and applications evolve, they may require higher system resources or compatibility with newer macOS versions, which may not be available in outdated versions.


Tap on the Apple icon placed in the top-left corner and select “System Preferences” or “System Settings”.

outdated mac slow down a mac all of a sudden

Select “Software Update”. If an update is available for your device, hit on the “Upgrade Now” button to install the latest version of macOS on your Mac.

Reason #8 Hardware Failure

When hardware components, such as the processor, memory (RAM), storage (e.g., hard drive or SSD), or graphics card, start to fail or malfunction, it can negatively impact the overall performance and speed of the Mac.

hardware failure on macImage source: Apple Support


Pay attention to any unusual symptoms, error messages, or behaviors exhibited by your Mac, such as unexpected crashes, freezes, or unusual noises.

These can indicate potential hardware problems. You can also run hardware diagnostics tools provided by Apple, such as Apple Diagnostics or Apple Hardware Test, to help identify hardware issues.

Read Also: How To Fix Macbook Pro Speakers Crackling [100% Working]

Reason #9 Low RAM

Yes, low RAM (Random Access Memory) can be a reason for slowing down a Mac all of a sudden. RAM is a type of computer memory that stores data that is being actively used by the CPU (Central Processing Unit) and other hardware components.

When the amount of available RAM is insufficient to handle the tasks and processes being performed on a Mac, it can result in performance degradation and slow operation.


To upgrade RAM on a Mac, follow these steps-

Step 1: Identify the correct RAM type for your Mac model.

Step 2: Purchase compatible RAM from a reputable source.

Step 3: Power off and unplug your Mac.

Step 4: Access the RAM slots by removing the back cover or other components.

Step 5: Install the new RAM modules, ensuring proper alignment and seating.

Step 6: Reassemble your Mac, plug it back in, and power it on. Your Mac should now have the upgraded RAM, which may improve its performance by providing more memory for tasks and processes.

If the thought of “Why is my Mac so slow all of a sudden” bothered you more, you can also try cutting down on animations to lessen the visual load of your device.

Click on the Apple menu in the top left corner of your Mac screen, and then select “System Preferences” from the drop-down menu. Select “Display and Dock”.

Under the “Dock” tab, you will see options related to animations and visual effects for the Dock. You can uncheck the boxes next to “Magnification” and “Animate opening applications” to disable these animations.

Reason #10 Too Many Apps Running in the Background

Having too many apps running in the background on a Mac can potentially slow down its performance.

When multiple apps are running simultaneously, they may consume system resources such as CPU, RAM, and storage, which can lead to reduced performance and slow down the overall operation of the Mac.


Review the apps that are currently running in the background and close any that are not actively in use.

You can do this by clicking on the app’s window and then selecting “Quit” from the application’s menu, or by right-clicking on the app’s icon in the Dock and selecting “Quit“. This will free up system resources and help improve performance.

Reason #11 Cluttered or Untidy Desktop

A cluttered or untidy desktop on a Mac is unlikely to have a significant impact on its performance. However, having a large number of files or icons on the desktop can potentially impact performance indirectly.

Too many apps running in background on mac


Create folders on your desktop and organize files into them based on their type, project, or any other logical categorization.

This can help you keep track of files and reduce clutter on the desktop. Also, delete any files that you no longer need or use from your desktop. If you have duplicate files, old screenshots, or temporary files, consider deleting them to free up space on your desktop.

Final Thoughts

This wraps up our guide explaining “Why is my Mac so slow all of a sudden”. A sudden slowdown in your Mac’s performance can be frustrating and disruptive to your workflow.

However, there are several common reasons why your Mac may slow down suddenly, and understanding these factors can help you troubleshoot and address the issue. By identifying and addressing these issues, you can help optimize your Mac’s performance and restore its speed.

Whether it’s closing unnecessary apps, clearing out storage, updating macOS, disabling animations, or using third-party tools to clean up your Mac, there are various steps you can take to improve your Mac’s performance. We hope this post helps you in staying productive and allows you to get the most out of your Mac experience.

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