MacBook Running Slow? 10 Safe Ways to Speed It Up

A MacBook that suddenly feels slow is often reacting to something specific: a demanding app, a full drive, a background task, an ageing battery or a software fault. Guessing—and installing a “cleaner” or deleting system files at random—can make the problem harder to diagnose.

The ten checks below move from quick, reversible actions to deeper troubleshooting. They apply to current macOS versions, with separate instructions where Apple silicon and Intel models behave differently. Back up important files before deleting data, repairing a disk or preparing the MacBook for service.

Key takeaways

• Start with a restart and Activity Monitor so you fix the cause, not just the symptom.
• Free storage using macOS tools and remove unwanted apps carefully; do not manually empty system cache folders.
• Login items, incompatible apps and unfinished updates are common software causes of poor performance.
• Safe mode and Apple Diagnostics help separate software trouble from hardware trouble.
• Back up before repair, and stop using the MacBook if there is battery swelling, liquid damage or repeated thermal shutdowns.

Before you start: identify what “slow” means

Notice when the delay occurs. A slow startup points towards login items, storage trouble or an operating-system issue. One slow app is more likely to be an app problem. A MacBook that becomes sluggish only during video calls, photo editing or gaming may simply be reaching its memory, graphics or thermal limits. Freezing, unexpected restarts and repeated kernel panic messages deserve more caution than an occasional spinning pointer.

Write down when the issue began, whether you recently installed an app or update, and whether it happens with accessories disconnected. Also check Apple menu > About This Mac for the model, year, chip and macOS version. If the window lists a Chip, it is an Apple silicon Mac; if it lists a Processor, it is Intel-based. That distinction matters for safe mode, diagnostics and upgrade options.

1. Restart, then test the same task again

A restart clears temporary processes and finishes some pending updates. Save your work, choose Apple menu > Restart, then repeat the task that felt slow. If performance returns to normal but deteriorates again after opening a particular app or connecting an accessory, you have a useful clue.

Avoid repeatedly forcing the MacBook off with the power button. Use a forced shutdown only when macOS is completely unresponsive, because unsaved work can be lost. If the Mac repeatedly freezes or restarts, move to the diagnostic steps below rather than treating forced shutdowns as a fix.

2. Use Activity Monitor to find the bottleneck

Open Activity Monitor from Applications > Utilities. Apple includes Activity Monitor and storage checks in its current slow-Mac troubleshooting guidance. Check these tabs while the slowdown is happening:

• CPU: click the % CPU column to see which processes are using the processor. A high figure during a demanding task can be normal; a process that remains unusually busy while you are doing nothing may need attention.
• Memory: look at the Memory Pressure graph. Green generally means memory is coping; sustained yellow or red indicates pressure. Closing unused apps or browser tabs may help.
• Disk: unusually heavy reads and writes can explain temporary sluggishness during indexing, syncing, backups or large file transfers.
• Energy: useful when fans are active or battery life has dropped, though Apple silicon MacBook Air models have no fan.

Quit an app normally first. If it is frozen, select it and use Activity Monitor’s stop button, understanding that unsaved changes may be lost. Do not force-quit unfamiliar macOS processes simply because their names look technical; many restart automatically and are essential.

3. Check storage and free space safely

Low available storage can leave macOS with less room for temporary files, updates and virtual memory. In current macOS versions, go to Apple menu > System Settings > General > Storage. The categories may take time to calculate.

Start with files you recognise: old installers, large downloads, unwanted videos and apps you no longer use. Empty the Bin only after checking its contents. Built-in recommendations may help you store files in iCloud, optimise media storage or review large files, but read each option before enabling it. Moving a file into cloud storage is not automatically the same as keeping an independent backup.

Do not manually clear the contents of system or Library cache folders as a routine speed fix. Caches normally improve performance, applications recreate them, and deleting the wrong data can cause sign-in, app or synchronisation problems. Likewise, third-party “cleaner” apps are not a substitute for identifying which app, file or process is responsible.

4. Reduce login items and background activity

Too many applications opening at sign-in can extend startup time and continue using memory afterwards. Go to System Settings > General > Login Items & Extensions, the path in Apple’s current Login Items & Extensions guide. Under Open at Login, remove items you do not need automatically. Review App Background Activity as well, but keep services you rely on for backups, security, messaging or cloud synchronisation.

Remove one or two questionable items at a time, restart, and test. This is more informative than switching everything off at once. Older macOS versions may place login items under Users & Groups, so menu wording can vary on legacy systems.

5. Update macOS and your applications

Updates can resolve compatibility, reliability and security problems. Check System Settings > General > Software Update and install updates that Apple offers for your Mac. Connect the charger, allow enough time and make a current backup before a major macOS upgrade. A MacBook may feel busy for a while afterwards as Spotlight, Photos and cloud services re-index or synchronise.

Update App Store apps from the App Store > Updates area. Apps installed elsewhere usually use their own updater or require a fresh installer from the developer. If one application became slow after a macOS update, confirm that its current version supports your macOS release. An older Mac may no longer qualify for the newest macOS, but it can still receive any compatible updates Apple makes available through Software Update.

6. Remove or reinstall a troublesome app

If the problem follows one app, test without its plug-ins, extensions or add-ons where possible. Check the developer’s support information, then update the app. Reinstallation can help when the application itself is damaged.

Before uninstalling, confirm where the app stores documents, templates, licences and local databases. Some professional, accounting, music and creative applications keep important data outside the Documents folder. Export or back up that data, then use the developer’s uninstaller if one is supplied. Download the replacement only from the App Store or the developer’s official website.

For crashes affecting several apps, record the exact message and test in safe mode rather than repeatedly reinstalling unrelated software.

7. Start in safe mode to isolate startup software

Apple says safe mode can help identify whether software loaded during startup is causing a problem. The procedure depends on the processor:

Apple silicon

1. Shut down and wait until the screen is black.
2. Press and hold the power button until Loading startup options appears.
3. Select the startup volume.
4. Hold Shift, then click Continue in Safe Mode.

Intel

1. Turn on or restart the Mac and immediately hold Shift.
2. Release it at the login window and sign in. A second login may be required.

Test the same task in safe mode, then restart normally. If the slowdown disappears only in safe mode, concentrate on login items, extensions, fonts or recently installed software. Safe mode is a diagnostic environment, not a setting to use permanently.

8. Check heat, power and battery condition

Heavy work, charging and warm rooms can raise temperatures. Use the MacBook on a hard, stable surface with its ventilation unobstructed. In Perth’s hotter weather, avoid leaving it in a parked car or direct sun. Close the demanding process you identified rather than placing the computer on a soft bed or cushion that can trap heat.

Check System Settings > Battery for battery information and any service recommendation. Battery mode can also affect performance: Low Power Mode intentionally reduces energy use, so compare behaviour while connected to a suitable power adaptor and with normal power settings.

Stop using and charging the MacBook if the case or trackpad is lifting, the battery appears swollen, there is a burning smell, smoke, sparks or liquid exposure. Disconnect power only if it is safe to do so and arrange professional assessment. Repeated heat-related shutdowns also warrant service; do not open the case or spray compressed air into it as a first response.

9. Run Apple Diagnostics when hardware is suspected

Apple Diagnostics can check internal hardware and may provide a reference code. Disconnect external devices except power, display, keyboard, mouse and network connection if required, then use Apple’s current procedure:

• Apple silicon: shut down, hold the power button until startup options appear, then hold Command-D.
• Intel: turn on the Mac and immediately hold D. If that does not work, Apple documents Option-D for internet-based diagnostics on compatible models.

Record any reference code and follow the on-screen guidance. A clean result does not prove every component is healthy, and Diagnostics does not assess every third-party app. Persistent freezes, storage errors, display artefacts, unusual noises or kernel panics still justify a professional diagnosis.

Most modern MacBooks have memory and flash storage integrated into the logic board, so the old advice to add RAM or swap an internal hard drive does not apply broadly. Some older Intel models can be upgraded, but compatibility and economics depend on the exact model. Check the model before buying parts or opening the computer.

10. Use Disk Utility First Aid only when symptoms point to storage

Disk Utility First Aid checks and repairs formatting and directory-structure errors; it is not a routine “tune-up” and modern macOS no longer uses the old repair-permissions maintenance ritual.

Make a current backup first. If important data is not backed up, the drive is disappearing, the Mac makes unusual storage-related noises, or First Aid reports an error it cannot repair, stop and seek help rather than repeatedly running repair tools.

For a Mac that still starts, open Applications > Utilities > Disk Utility, choose View > Show All Devices, select the relevant volume and run First Aid. Apple’s detailed order can vary with the disk layout. If the startup disk cannot be checked while in use, Apple may direct you to macOS Recovery. Recovery and operating-system reinstallation are later steps; do not erase the Mac as a casual performance fix.

Back up before repair or deeper troubleshooting

A reliable backup matters before disk repair, a major upgrade, macOS recovery work or hardware service. Apple warns that service may require the startup disk to be erased or replaced.

For the broadest local backup, connect an external drive and set up System Settings > General > Time Machine. Apple’s Mac backup guide describes Time Machine, iCloud and manual copies as available approaches. Time Machine backs up files and can help migrate apps, accounts and settings during recovery. Let the backup finish, then open it and verify several important files rather than assuming success from an icon alone.

iCloud can synchronise selected data—such as iCloud Drive, Photos, contacts and notes—across signed-in devices. It is useful, but check which categories are enabled and whether uploads have completed. Synchronisation is not identical to a versioned, independent backup: deleting or changing a synced item may propagate to other devices. A manual copy of critical documents to another storage device is a useful additional safeguard.

Before a service appointment, follow the repairer’s instructions. Apple’s current checklist includes creating a backup and turning off Find My Mac so diagnostics or repair are not blocked by Activation Lock. Do not remove the Mac from your account until the service provider asks you to, and never give anyone your Apple Account password. You may need your macOS account password for testing at a service location.

When a slow MacBook needs professional help

Arrange help when the MacBook will not start, repeatedly kernel-panics or shuts down, reports persistent disk errors, shows battery swelling, has had liquid exposure, or remains slow after the reversible checks above. Important files without a verified backup are another reason to stop before Recovery, erasure or hardware work.

For Perth households, remote workers and small businesses, MacBook repair and troubleshooting support can help distinguish an app problem from a storage, battery or logic-board fault. If you are unsure what to try next, contact Perth Computer Experts with the model, macOS version, symptoms and any diagnostic code. That gives the technician useful evidence without exposing your files or passwords.