Why is my Mac Running Slow?
Macs can naturally slow down over time. Apps take longer to open, and everyday tasks can feel noticeably sluggish.
This is usually caused by a combination of factors, such as limited storage space, too many background processes, or outdated software. In this guide, we'll walk through the most common causes and how to fix them so your Mac runs smoothly again.
Jump straight to:
Quick fix: If your Mac has suddenly become slow, try restarting it first. A restart clears temporary files and stops lingering background processes, which can often improve performance straight away.
Step 1. Clear Disk Space
One of the most common reasons a Mac slows down is a lack of storage space. When your disk fills up, your Mac has less room to run processes efficiently, which in turn leads to slower performance.
If you've seen the dreaded “Your disk is almost full” warning, it's a clear opportunity to improve your Mac's health and speed in one fell swoop.
To quickly free up space, you can:
- Delete large or unused files
- Remove apps you no longer use
- Empty your Trash
- Clear temporary files and downloads
If you want a full walkthrough to quickly reclaim plenty of storage, see our guide on how to clear disk space on Mac.
Remove Duplicate Files
One of the major space-hoggers is duplicate files, especially if you have lots of photos, videos, music, or documents.
Manually finding duplicates is time-consuming, but tools like Duplicate Sweeper can help you quickly scan your Mac and remove duplicate files in just a few clicks.
- Launch Duplicate Sweeper on your Mac.
- Choose the folders you'd like to scan, and click "Start Duplicate Search".
- Select which files to keep:
- Automatic: keep one file from each duplicate group based on date created or modified.
- Manual: choose which files to keep or remove yourself.
- Click "Trash Selection".
The files you choose to delete will be moved to your Mac's Trash Can / Bin in case you change your mind. You can empty the Trash to permanently delete those files and reclaim your storage space.
Step 2. Close Background Apps
Apps can run processes in the background on your Mac, even when you're not using them. These processes can use a lot of your Mac's CPU and memory, which can slow everything down.
Common culprits include web browsers with lots of tabs open, video editing software, and apps running in the background.
You can quickly see what's using the most resources with Activity Monitor:
- Go to Applications > Utilities > Activity Monitor.
- Click the "CPU" or "Memory" tab.
- Look for apps using a high percentage of resources.
- Select an app or process and click the "X" to close it.
Since your Mac has limited resources, running too many tasks at once can cause slowdowns. If the CPU or Memory usage in Activity Monitor shows 90-100%, your Mac is likely overloaded and struggling to keep up.
Tip: Only close apps you recognize. Avoid quitting system processes unless you're sure what they do.
Step 3. Disable Unnecessary Startup Apps
If your Mac is slow when starting up, but is fine once it's running, too many apps may be automatically launching as soon as you log in.
Reducing the number of startup apps can noticeably speed up boot time and improve overall performance.
To manage startup apps:
- Open System Settings.
- Go to General > Login Items & Extensions.
- Select any apps you don't need at startup.
- Click the "-" button to remove them.
Tip: Scroll down and check the “Allow in the Background” section. Some apps continue running even when closed and can slow your Mac over time - disable the ones you don't need to save even more memory.
Step 4. Update macOS
We're all guilty of dismissing the macOS update notifications. However, outdated software can slow your Mac down, especially if there are bugs or performance issues that have been fixed in newer updates.
Keeping macOS up to date helps improve stability, security, and overall performance (not to mention shiny new features!).
To check for updates:
- Open System Settings.
- Go to General > Software Update.
- Install any available updates.
Once updated, your Mac may run more smoothly — particularly if the slowdown was caused by software issues.
Tip: You can set your Mac to automatically update. To do this, in the Software Update settings, click the (i) next to "Automatic Updates". Here, you'll find options to automatically download and install system updates or app updates.
Step 5. Check for Hardware Limitations
If you've tried the steps above and your Mac is still slow, it may be your physical hardware holding you back.
Older Macs, or more generally, devices with limited RAM or slower storage, can struggle to keep up with modern apps and operating systems.
Signs that hardware may be the problem include:
- Slow performance even after freeing up space and closing apps
- Frequent lag when switching between programs
- Long startup times, even with minimal login items
- Struggling to use multiple apps at once
To find your Mac's hardware information, go to Apple Menu > About This Mac.
For more details, click "System Report...".
If your Mac is several years old, it may be worth considering an upgrade to a newer device for better performance.
Newer models come with more powerful processors, more RAM, and faster storage options, which can significantly improve performance.
Step 6. Check your Internet Connection
If your Mac only feels slow when browsing the web or streaming, the issue is likely your internet connection rather than your device itself.
Common signs of a poor internet connection include slow-loading websites, buffering videos, or delays when using online apps.
To troubleshoot this:
- Close Unused Tabs and Apps: Having multiple browser tabs or internet-reliant apps open can strain your bandwidth and slow everything down. Close any tabs or apps you aren't actively using.
- Switch to an Ethernet Connection: If your Wi-Fi is unstable, consider using an ethernet cable for a faster, more reliable connection.
- Restart Your Router: A simple router restart can often resolve connectivity issues.
- Test Your Speed: Use an online speed test tool to check your internet speed. If it's slower than expected, contact your internet service provider (ISP).
- Check Network Usage: Use the Activity Monitor on your Mac to see which apps are using the most network resources and close unnecessary ones.
Improving your connection stability and speed can have a significant impact on your Mac's online performance.
Conclusion
A slow Mac can be frustrating, but with a few simple steps, you can bring back its speed and performance. From clearing up hard drive space and updating macOS to checking your internet connection and considering hardware upgrades, there are multiple ways to address the causes of sluggishness.
By regularly maintaining your Mac, keeping your software up to date, and optimizing your system's resources, you can ensure it continues running smoothly for years to come. If you follow these tips and address any issues promptly, you'll enjoy a faster, more responsive Mac experience.
Your Mac is designed to perform at its best—sometimes, it just needs a little help to get back to top speed.
Frequently Asked Questions
Is my Mac too old?
Your Mac may be considered “too old” if it can no longer run the latest version of macOS. Apple regularly drops support for older models with each new update, and once your Mac stops receiving updates, performance, security, and app compatibility can all start to suffer.
Why is my Mac so slow all of a sudden?
Sudden slowdowns are often caused by something running in the background, low storage space, or a recent software issue. Try restarting your Mac first, then check Activity Monitor and your available storage to identify the cause.
Does low storage slow down a Mac?
Yes. When your storage is nearly full, your Mac has less room to run processes efficiently. This can lead to slower performance, especially when opening apps or switching between tasks.
How much free space should a Mac have?
As a general rule, try to keep at least 10-20% of your storage free. This gives your Mac enough space to run smoothly and helps prevent slowdowns caused by low disk space.
Does restarting a Mac help?
In many cases, yes. Restarting your Mac clears temporary files and stops background processes that may be using up system resources. It's often the quickest way to fix minor performance issues.
Publisher:Wide Angle Software
