Why Is My Laptop So Slow? 10 Fixes That Work

Ten practical checks to speed up a slow Windows or Mac laptop, from start-up programs and full storage to failing drives, with how to know when to upgrade.

A laptop rarely becomes slow for one reason. It is usually a pile-up of small things: too many programs starting at once, a nearly full drive, an old mechanical disk, heat, or software that has not been updated for a while. Work through the checks below in order, from easiest to most involved.

First, find out what is busy

Open the task manager on Windows or Activity Monitor on a Mac and look at the CPU, memory and disk columns.

Disk near 100 percent points to a slow or failing drive, or heavy background activity like updates or indexing.
Memory almost full suggests too many programs or browser tabs for the RAM you have.
CPU constantly high with nothing obvious open suggests a stuck process, malware or overheating.

Knowing which one is the bottleneck saves you from trying fixes that do not apply.

Ten fixes, in a sensible order

Restart properly. Many people never shut down; a restart clears memory and finishes pending updates.
Install updates. System and driver updates fix bugs that cause slowness. If an update seems to hang, see Windows update stuck.
Trim start-up programs. Disable apps you do not need the moment you log in, such as chat tools and launchers.
Free up storage. Aim to keep at least 15 to 20 percent of the drive free. Remove old downloads, large videos and unused programs.
Clean up the browser. Remove extensions you do not use, close dozens of tabs and clear stale data.
Check for malware. Run a scan with the built-in security tools. See signs your computer has a virus.
Check heat and dust. If fans roar and the case is hot, performance is throttled. Our article on laptop overheating explains the fixes.
Check power settings. A battery-saver mode limits performance. Plug in and choose a balanced or performance profile.
Check drive health. Tools that read the drive's reported health can warn of failure. Back up first if anything looks wrong.
Consider a clean reinstall. If the system is years old and cluttered, a fresh install can feel like a new machine. Back up and have your licences handy.

Know what hardware is limiting you

If the basics do not help, the hardware may be the limit:

Symptom	Likely culprit	Typical remedy
Slow start and slow programs, old laptop	Mechanical hard drive	SSD upgrade
Slows when many tabs or apps are open	Not enough RAM	Add memory if possible
Slow everywhere, very old processor	Machine is past its best	Replace
Hot and noisy under light use	Dust or dried thermal paste	Clean and service

Our guide to RAM versus SSD upgrades helps you choose, and SSD upgrade costs puts figures on it.

Common mistakes

Installing "PC cleaner" or "speed booster" programs. Many are useless and some are harmful. The built-in tools are enough for most people.
Deleting system files to gain space, which can break the machine.
Running two security tools that fight each other.
Ignoring a full drive and wondering why updates fail.
Leaving it too long before backing up when the drive is clearly failing.

When to ask for help

If the machine is clicking, freezing, showing disk errors or you suspect infection, stop and get it looked at. Sensible costs are covered in how much computer repair costs in the UK.

On Compito you can search by postcode, compare ID-verified local providers and send a request describing the symptoms and what you have tried. You receive an offer, accept and pay online and message the provider to agree what will be done. See tech support services.

A worked example: a before-and-after

A four-year-old laptop takes three minutes to start and stutters with email and a few browser tabs. The task manager shows twenty-two programs starting at login, a drive that is 94 percent full and a browser with thirty extensions. Over an evening the owner disables most start-up items, removes eighteen extensions, clears out old downloads and videos, and restarts. Start-up falls to under a minute and the stutter largely goes. No money spent. The drive is still mechanical, so an SSD would be the next step if it needs to go further.

A ten-minute routine to run monthly

Restart the computer.
Check for system and driver updates.
Look at the start-up list for anything new.
Empty the downloads folder and bin.
Check how much free space remains.
Glance at the browser extensions list.

Small, regular care prevents the slow build-up that makes people think they need a new machine.

Differences between Windows and Mac habits

Windows machines tend to collect start-up programs and background updaters, so the start-up list matters most. Macs are often hampered by full storage and a large number of login items, so check the login items list and storage panel. On either, browser tabs and extensions are common causes of slowness that people overlook.

Edge cases

A machine that is only slow when on battery. Check the power mode, as saving modes throttle performance.

A machine that is slow after an update. Give it a day to finish background tasks such as indexing before judging.

A machine that is slow online only. The computer may be fine and the connection the problem. Test with a wired speed check.

Slow with one program only. Reinstall or update that program, or look for a large file or profile it is struggling with.

Knowing when it is time to stop

If you have done the tidy-up and the machine is still slow, and it is several years old with a mechanical drive and little memory, the next step is a hardware upgrade or a replacement, not another cleaning tool.

Frequently asked questions

Does a factory reset speed up a laptop?

Often it does, because it removes accumulated software and settings. It also removes your files and programs, so back up first and be ready to reinstall what you need.

How much free space does a laptop need?

There is no exact figure, but keeping around a fifth of the drive free gives the system room for updates and temporary files. Very full drives tend to slow down.

Is my laptop too old to speed up?

Not necessarily. Many machines from several years back respond well to an SSD and a tidy-up, provided they still receive security updates.

Find tech support providers near you

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