Why Is My Mac So Slow? 20 Proven Fixes (2026)

Your Mac is running slow because of limited storage space, too many startup apps, outdated software, or resource-heavy background processes. The fastest fixes are closing unused applications, freeing up disk space, and restarting your Mac. For deeper issues, check Activity Monitor for CPU-hogging processes, disable unnecessary login items in System Settings, and make sure you are running the latest version of macOS.

Below are 20 proven methods to diagnose and fix a slow Mac, whether you own a MacBook, iMac, or Mac mini.

Table of contents

• Why is my Mac so slow?
• 1. Close applications you aren't using
• 2. Delete apps you don't need
• 3. Check Activity Monitor
• 4. Disable unnecessary startup apps
• 5. Clear cache from browsers
• 6. Optimize disk space usage
• 7. Install macOS system updates
• 8. Delete projects and files within applications
• 9. Use a system cleaner tool
• 10. Reduce visual effects
• 11. Clear system cache
• 12. Manage browser extensions
• 13. Update outdated apps
• 14. Check your internet speed
• 15. Fix overheating issues
• 16. Check for malware
• 17. Upgrade your RAM or switch to an SSD
• 18. Restart your Mac
• 19. Get professional maintenance
• 20. Your Mac is simply too old
• FAQ

Why is my Mac so slow?

A slow Mac typically comes down to one or more of these seven root causes:

1. Low storage space. When your drive is more than 80% full, macOS struggles to manage virtual memory and temporary files. Apple recommends keeping at least 10-20% of your storage free for smooth operation.
2. Too many startup items. Applications that launch at login consume CPU and memory before you even open a browser. Reviewing login items in System Settings is one of the quickest wins.
3. Outdated software. Running an older version of macOS means missing out on performance optimizations. The latest release, macOS 26 Tahoe, includes efficiency improvements for both Apple Silicon and supported Intel models.
4. Background processes. Resource-heavy applications running in the background strain your CPU and memory. Activity Monitor reveals exactly which processes are consuming the most resources.
5. Malware. Though less common on macOS than on Windows, malware can still degrade performance. macOS includes built-in protection through XProtect, but a periodic scan with a dedicated tool adds another layer of security.
6. Hardware limitations. Aging hardware, particularly insufficient RAM or a traditional hard drive instead of an SSD, creates bottlenecks that no software fix can fully resolve. Note that Apple Silicon Macs (M1 and later) use unified memory that cannot be upgraded after purchase.
7. Browser overload. Dozens of open tabs and poorly coded extensions consume significant memory. Chrome alone can use several gigabytes of RAM with enough open tabs.

1. Close applications you aren't using

Every open application claims a share of your Mac's memory and processing power, even when it sits idle in the background. Closing what you do not need is the single fastest way to reclaim resources.

To see which apps are running, look for the small dot beneath each icon in the Dock. You can also press Command + Tab to open the App Switcher.

To quit an app, right-click its Dock icon and choose Quit, or select it and press Command-Q.

2. Delete apps you don't need

Unused applications take up storage and sometimes run background services you never asked for. Removing them frees both disk space and system resources.

To find candidates for removal:

1. Open Finder and go to Applications.
2. Sort by Date Last Opened.
3. Delete any application you have not used in months.

Large apps like GarageBand (over 1.5 GB) are common culprits. If you need them later, you can always re-download from the App Store.

👉 Learn more: 21 Best Mac Apps

3. Check Activity Monitor

Activity Monitor is the built-in diagnostic tool that shows real-time CPU, memory, energy, disk, and network usage for every process on your Mac. Open it from Applications > Utilities > Activity Monitor.

Click the CPU tab and sort by % CPU to identify the heaviest processes. If a process you do not recognize is consuming excessive resources, select it and click the X button in the toolbar to force quit it.

The Memory tab is equally useful. Check the Memory Pressure graph at the bottom: if it stays green, your RAM is adequate; yellow or red indicates memory strain.

4. Disable unnecessary startup apps

Too many login items is one of the top reasons a Mac feels slow after booting. Here is how to trim the list:

1. Open System Settings (click the Apple icon in the top-left corner, then choose System Settings).
2. Select General in the sidebar, then click Login Items & Extensions.
3. Review the list under Open at Login.
4. Select any app you do not need at startup and click the minus (-) button to remove it.

While you are there, scroll down to Allow in the Background and disable any services you do not use regularly.

5. Clear cache from browsers

Browser caches grow steadily over time and can occupy several gigabytes. Clearing them frees storage and often resolves sluggish page loading.

Go to your browser's Privacy or Clear Browsing Data settings and remove cached images, files, and cookies. Be selective: you may want to keep saved login information and site preferences.

6. Optimize disk space usage

To check how your storage is allocated, go to Apple Menu > About This Mac > More Info > Storage Settings (or on older macOS, Apple Menu > About This Mac > Storage).

If you are using more than 80% of your total storage:

• Delete large files and old downloads.
• Move infrequently accessed files to an external drive or USB.
• Use cloud storage services like iCloud, Dropbox, or Google Drive. iCloud integrates with macOS to offload files automatically when local space runs low.

Apple's built-in Optimize Storage feature in System Settings can also help by moving old files to iCloud and emptying the Trash automatically.

7. Install macOS system updates

Each macOS update includes performance optimizations, bug fixes, and security patches. Running the latest version, currently macOS 26 Tahoe, ensures your Mac benefits from these improvements.

To check for updates:

1. Click the Apple icon in the upper-left corner.
2. Open System Settings.
3. Select General, then click Software Update.
4. Click Update Now if an update is available.

Enable Automatic Updates so macOS installs future patches without manual intervention.

8. Delete projects and files within applications

Media-heavy applications such as Photos, iMovie, and GarageBand can harbor gigabytes of project files you no longer need. Open these apps, review their libraries, and delete old projects. Remember to empty the Trash afterward to reclaim the space.

9. Use a system cleaner tool

Third-party maintenance tools can automate cleanup tasks that would otherwise take hours to do manually. Popular options include:

• CleanMyMac: An all-in-one tool for removing junk files, managing login items, and scanning for malware. Consistently rated among the best Mac cleaners.
• CCleaner: Offers a free tier for clearing caches, logs, and large files. A solid choice for users who prefer granular control.
• OnyX: A free, advanced maintenance utility for running system scripts and clearing deep caches.

For a quick memory check without installing anything, search "Activity Monitor" in Spotlight and review the Memory tab.

10. Reduce visual effects

Transparency and animation effects look polished, but they consume GPU resources, particularly on older Macs.

To dial them back:

1. Open System Settings > Accessibility > Display.
2. Enable Reduce motion to limit window animations.
3. Enable Reduce transparency to remove translucent menu bars and sidebars.

You can also open System Settings > Desktop & Dock and disable Animate opening applications to stop the bounce animation when launching apps.

11. Clear system cache

System-level caches build up over months and can consume multiple gigabytes. To clear them manually:

1. Open Finder, click Go in the menu bar, and select Go to Folder.
2. Type ~/Library/Caches and press Enter.
3. Open individual folders and delete the files inside. Do not delete the folders themselves, as some system processes depend on them.
4. Empty the Trash to complete the cleanup.

For system-wide caches, repeat the process with /Library/Caches (without the tilde).

12. Manage browser extensions

Extensions add functionality but also increase memory usage and can conflict with each other. Audit your extensions periodically and remove any you no longer use.

Safari: Go to Safari > Settings > Extensions. Uncheck to disable or click Uninstall to remove.

Chrome: Type chrome://extensions/ in the address bar. Toggle extensions off or click Remove.

Firefox: Type about:addons in the address bar. Click the three-dot menu next to each extension to disable or remove it.

13. Update outdated apps

Outdated apps may not be optimized for the latest macOS version, causing compatibility issues and memory leaks. Keeping everything current reduces these problems.

App Store apps: Open the App Store and click Updates in the sidebar. Click Update All.

Third-party apps: Check each app's menu for a "Check for Updates" option, or visit the developer's website for the latest release.

14. Check your internet speed

Slow page loads and buffering videos often point to a network problem rather than a Mac problem. Run a quick test at Speedtest.net to rule out your internet connection. If speeds are consistently below your plan's advertised rate, restart your router or contact your provider.

15. Fix overheating issues

When a Mac overheats, macOS throttles the CPU to prevent damage. The result is noticeable slowdowns, loud fan noise, and a chassis that feels hot to the touch.

Common fixes include:

• Ensure proper ventilation. Keep vents unobstructed and avoid using your MacBook on soft surfaces like beds or couches.
• Clean the vents. Compressed air removes dust buildup that traps heat.
• Use a cooling pad. An elevated stand or active cooling pad improves airflow, particularly for MacBook users.
• Check Activity Monitor. A runaway process can spike CPU usage and generate excessive heat.

Apple Silicon Macs (M1, M2, M3, M4, M5) run cooler than Intel models. The MacBook Air, for example, has no fan at all. If your Apple Silicon Mac still overheats, a software issue or background process is the most likely cause.

16. Check for malware

macOS includes XProtect and Gatekeeper for built-in malware protection, but no system is completely immune. Signs of malware include unexpected pop-ups, browser redirects, and sudden performance drops.

For an additional scan, consider tools like CleanMyMac (which includes a malware module), Malwarebytes for Mac, or Apple's own built-in protections updated through regular macOS patches.

17. Upgrade your RAM or switch to an SSD

For older Intel Macs, a hardware upgrade can deliver the most dramatic speed improvement. Switching from a hard drive to an SSD typically reduces boot times from minutes to seconds, and adding RAM helps if your Mac frequently shows high memory pressure in Activity Monitor.

Important for Apple Silicon owners: Macs with M1, M2, M3, M4, or M5 chips use unified memory soldered to the logic board. RAM and storage cannot be upgraded after purchase, so choose your configuration carefully when buying. If your Apple Silicon Mac is struggling with memory, focus on the software fixes in this guide, or consider upgrading to a model with more unified memory.

👉 Learn more: Best Video Editing Software for Mac | Best Games for Mac

18. Restart your Mac

A restart clears temporary files, resets system processes, and releases memory that has been claimed by long-running apps. If your Mac has been running for days or weeks without a reboot, a simple restart often provides an immediate speed boost.

Click the Apple icon in the top-left corner and select Restart. Make this a weekly habit for consistent performance.

19. Get professional maintenance

If you have worked through every fix on this list and your Mac still feels sluggish, a professional diagnosis may be necessary. Apple Stores offer free diagnostics through the Genius Bar, and authorized service providers can inspect hardware components like the battery, logic board, and thermal system.

20. Your Mac is simply too old

Technology moves quickly, and even well-maintained Macs eventually reach end of life. Apple typically supports Mac models for seven to eight years with macOS updates. If your Mac no longer receives the latest macOS version, its hardware may not meet the demands of modern apps and web standards.

If a brand-new Mac is not within your budget, consider a refurbished Mac. A refurbished model from a trusted seller offers the same performance at a lower price, backed by a professional warranty.

👉 Learn more: Are Intel Macs Obsolete? | How Long Do MacBooks Last?

Final thoughts

Most Mac slowdowns come down to a handful of fixable causes: full storage, too many startup items, and outdated software. Working through the steps above, starting with the quick wins like closing unused apps and restarting, will resolve the majority of performance issues.

If your Mac is beyond repair or simply too old, exploring a refurbished replacement is a practical alternative. Compare prices across trusted sellers on RefurbMe to find the best deal:

👉 Related articles: Mac Won't Turn On: 10 Easy Ways To Fix It | Are MacBooks Worth It? | Best Refurbished MacBooks

FAQ

Why is my MacBook so slow all of a sudden?

A sudden slowdown usually points to a specific trigger: a recently installed app consuming excessive CPU, a macOS update that needs a restart to finish, a nearly full disk, or a background process that has hung. Open Activity Monitor (Applications > Utilities > Activity Monitor), sort by CPU usage, and force quit any process that is consuming an unusual share of resources.

How do I find out what is slowing down my Mac?

Activity Monitor is the best built-in tool for diagnosing performance problems. Open it and check the CPU, Memory, and Disk tabs to identify which applications or processes are using the most resources. High memory pressure (shown in the graph at the bottom of the Memory tab) indicates your Mac needs more free RAM.

Does resetting NVRAM or SMC speed up a Mac?

Resetting NVRAM (or PRAM on older models) and the SMC can resolve specific issues like display problems, sound settings, or fan behavior, but these resets rarely fix general slowness. They are worth trying if you have unusual hardware behavior alongside poor performance. Note that Apple Silicon Macs do not have a traditional SMC reset; restarting the Mac accomplishes the same result.

How much storage should I keep free on my Mac?

Apple does not publish a specific recommendation, but keeping at least 10-20% of your total storage free is a widely accepted guideline. macOS needs free space for virtual memory, temporary files, and system updates. When your drive approaches capacity, performance degrades noticeably.

Will upgrading to an SSD fix a slow Mac?

If your Mac still uses a traditional hard drive (common in pre-2013 models and some iMacs through 2019), upgrading to an SSD is the single most impactful hardware change you can make. Boot times drop from over a minute to roughly 15 seconds, and applications launch almost instantly. All Macs sold since late 2020 already include SSD storage.