How to Speed Up a Slow Computer: 12 Practical Fixes

Few things test your patience like a computer that used to feel quick and now takes forever to start, open a browser, or switch between windows. The spinning wheel or the frozen cursor shows up at the worst possible moment, usually when you are on a video call or trying to finish something before a deadline. It is tempting to assume the machine is simply old and needs replacing, but in many cases the slowdown has a fixable cause.

This guide walks through twelve practical fixes that work on both Windows and Mac, using only the tools that already come with your computer. You will not need to buy any cleaning software or “speed booster” apps, and most of the steps take just a few minutes. Work through them roughly in order, since the earliest fixes are the quickest and often make the biggest difference.

First, figure out what “slow” actually means

Before changing anything, take a moment to notice when the slowness happens. A computer that is slow only when starting up has a different problem from one that crawls whenever you open twenty browser tabs, and both are different from a machine that stutters only during video calls. Pinpointing the pattern saves you from trying fixes that do not apply.

Both operating systems include a built-in tool that shows what is using your computer’s resources right now:

• Windows: Press Ctrl + Shift + Esc to open Task Manager. Click “More details” if you see a short list, then look at the Processes tab. Click the CPU, Memory, or Disk column headers to sort by what is using the most.
• Mac: Open Activity Monitor from Applications, then Utilities, or search for it with Spotlight (Command + Space). The CPU, Memory, Energy, and Disk tabs show which apps are demanding the most.

If one program sits near the top of the list constantly, you have found a strong lead. If memory use is close to the maximum, you will benefit most from the steps about closing apps and browser tabs. If the disk is busy all the time, storage space and background syncing are the likely culprits.

Quick wins that take five minutes

Fix 1: Restart your computer properly

It sounds too simple to matter, but a real restart clears out temporary data, ends stuck processes, and lets pending updates finish. Many people only ever close the lid or put their computer to sleep, which means it may go weeks without a fresh start.

On Windows, note that clicking Shut Down may not fully reset the system, because a feature called Fast Startup saves part of the system state to make the next boot quicker. Choosing Restart from the Start menu’s power options gives you a clean slate. On a Mac, choose Restart from the Apple menu, and consider unchecking the option to reopen windows when logging back in if you want everything to start fresh.

Make a habit of restarting at least once a week. If your computer feels noticeably faster afterward and then slowly bogs down again over several days, that pattern points toward a program that gradually uses more and more memory, which the next few fixes can help you find.

Fix 2: Close apps and browser tabs you are not using

Every open app and browser tab takes a share of your computer’s memory. Modern browsers are especially hungry, because each tab can behave like a small program of its own, running scripts, playing video, and refreshing content in the background. Thirty open tabs can easily use more memory than everything else on your computer combined.

A few habits help a lot:

• Close tabs you have finished with, and use bookmarks or a reading list for pages you want to come back to later.
• Turn on your browser’s memory-saving or tab-sleeping feature if it has one. Most major browsers now include an option that pauses inactive tabs automatically.
• On a Mac, remember that clicking the red close button on a window often leaves the app running. Use Command + Q to quit an app completely. A small dot under an app’s icon in the Dock means it is still open.
• On Windows, check the system tray near the clock, including the small arrow that reveals hidden icons. Apps there are running in the background even if you never see their window.

Lighten the load on your system

Fix 3: Trim the programs that launch at startup

Many apps quietly add themselves to your startup list when you install them, so they launch every time you sign in. Chat apps, cloud storage tools, game launchers, printer utilities, and update helpers are common examples. Each one adds a little to your startup time and keeps using resources all day.

On Windows: Open Task Manager and select the Startup apps tab (called Startup on some versions). You will see each program along with an estimate of its startup impact. Right-click anything you do not need right away and choose Disable. This does not uninstall the program; it simply stops it from launching automatically. You can still open it whenever you want. You can also find the same list in Settings under Apps, then Startup.

On a Mac: Open System Settings, go to General, then Login Items (on older versions, look in System Preferences under Users and Groups). Remove apps you do not need at login by selecting them and clicking the minus button. The same screen often lists background items that apps have allowed to run; you can switch off the ones you recognize and do not need.

If you are unsure what a startup item does, leave it alone and search for its name later from a trusted source. Antivirus tools, accessibility software, and drivers for hardware you use every day are generally worth keeping.

Fix 4: Free up storage space

When your main drive is nearly full, the system has less room for temporary files and memory swapping, and everything slows down. There is no single magic number, but many technicians suggest keeping a healthy chunk of your drive free rather than running it close to full.

Start with the built-in tools, which are safer than third-party cleaners:

• Windows: Go to Settings, then System, then Storage. You will see what is taking up space and can use the Cleanup recommendations to remove temporary files, old Windows update files, and items in the Recycle Bin. Turning on Storage Sense lets Windows clear some of this automatically.
• Mac: Open System Settings, go to General, then Storage. The recommendations there can help you store files in iCloud, empty the Trash automatically, and review large files and documents you no longer need.

Then look at the usual suspects by hand: the Downloads folder, old video files, duplicate photo libraries, and installers for programs you already set up. Moving large files you rarely use to an external drive is a simple way to reclaim space without losing anything.

Fix 5: Uninstall programs you no longer use

Over the years, computers collect apps the way kitchen drawers collect rubber bands. Free trials that expired, games nobody plays, and software that came preinstalled on the machine all take up space, and some of them run background services or update checkers that you never asked for.

On Windows, go to Settings, then Apps, then Installed apps, and sort by size or install date. Click the three-dot menu next to anything you do not need and choose Uninstall. On a Mac, most apps can be removed by dragging them from the Applications folder to the Trash, though some include their own uninstaller that does a more thorough job. Check the app’s folder or the developer’s instructions if one exists.

Be cautious with anything whose name you do not recognize, especially entries that mention drivers, frameworks, or runtimes. Other programs may depend on them. When in doubt, look the name up before removing it.

Keep your software current and clean

Fix 6: Install system and app updates

Updates are not only about new features. They often include performance improvements, bug fixes that stop programs from leaking memory, and security patches that close holes malware could use. Running an outdated system can be slower and less safe at the same time.

• Windows: Open Settings and select Windows Update, then click Check for updates. Also look under Advanced options for optional updates, which sometimes include driver updates for your hardware.
• Mac: Open System Settings, go to General, then Software Update. App Store apps update through the App Store; other apps usually have a Check for Updates option in their own menu.

Do not forget your browser, which may update itself only after you restart it. A browser that has been left open for weeks may be running an older version even though a newer one has already downloaded.

One caution: if your computer is very old, the newest major version of the operating system may be designed for more powerful hardware. Before making a big jump, check that your model is officially supported and read what other owners of the same model report.

Fix 7: Scan for malware and unwanted software

Malicious software, adware, and unwanted browser extensions can eat up processing power, flood you with pop-ups, and slow your browser to a crawl. You do not need to buy anything to check for them.

Windows includes Microsoft Defender, found in the Windows Security app. Open it, choose Virus and threat protection, and run a quick scan, or a full scan if you have time and suspect a problem. Macs include built-in protections that check apps and block known malware automatically; keeping macOS updated keeps those protections current.

Next, review your browser extensions. Open your browser’s extensions or add-ons page and remove anything you did not knowingly install or no longer use. Extensions that promise coupons, shopping deals, or “faster browsing” are frequent sources of slowdowns and unwanted tracking. Fewer extensions almost always means a faster browser.

Watch out for pop-ups claiming your computer is infected and urging you to call a number or download a cleaner. Legitimate security tools do not work that way. Close the window, and if it will not close, quit the browser completely.

Tune settings and background activity

Fix 8: Adjust visual effects and power settings

Animations, transparency, and other visual flourishes look nice but take a small amount of work from your graphics hardware. On older or lower-powered computers, turning some of them off can make menus and windows feel snappier.

Visual effects: On Windows, search for “Adjust the appearance and performance of Windows” in the Start menu. Choose Adjust for best performance, or pick and choose individual effects to turn off. On a Mac, go to System Settings, then Accessibility, then Display, and turn on Reduce motion and Reduce transparency.

Power mode: Laptops often slow themselves down to save battery. On Windows, go to Settings, then System, then Power and battery, and set Power mode to Best performance or Balanced while plugged in. On a Mac laptop, check the Battery section of System Settings for Low Power Mode and make sure it is not switched on when you need full speed. Remember that performance mode uses more energy, so you may want to switch back when you are working on battery.

Fix 9: Tame cloud syncing and background tasks

Cloud storage apps, photo libraries, and backup tools are wonderful until they decide to upload thousands of files while you are trying to work. A large sync can keep your disk, processor, and network busy for hours.

If you notice a sync or backup app near the top of Task Manager or Activity Monitor, you have a few options. Most of these apps let you pause syncing temporarily from their menu bar or system tray icon. You can also choose which folders sync, rather than syncing everything. Search indexing is another common background task; after a big update or a large file transfer, both Windows and Mac may spend some time re-indexing files, and the slowdown usually goes away on its own once that finishes.

If your computer is slow right after a major system update, give it a day of normal use with the power connected before deciding something is wrong. Background optimization after updates is normal on both platforms.

Look after the hardware

Fix 10: Check your drive health and type

The kind of storage drive inside your computer has a huge effect on how fast it feels. Older computers often use a traditional hard disk drive with spinning platters, while newer machines use solid-state drives that have no moving parts and are dramatically faster at starting up and opening programs.

On Windows, open Task Manager, go to the Performance tab, and click on your disk; it will say whether it is an SSD or HDD. The Defragment and Optimize Drives tool, which you can find by searching the Start menu, shows the same information and lets you run optimization. Windows handles this automatically on a schedule, and it uses a different, appropriate method for SSDs. On a Mac, choose About This Mac from the Apple menu, then More Info or System Report, and look under Storage.

If your computer makes clicking or grinding noises, freezes for several seconds while accessing files, or shows disk warnings, back up your important files right away. Those can be signs of a failing drive. On a Mac, Disk Utility’s First Aid feature can check a drive for errors. On Windows, the built-in error-checking tool is available by right-clicking a drive in File Explorer, choosing Properties, then the Tools tab.

Fix 11: Keep it cool and clean

Heat is a silent performance killer. When a computer gets too hot, its processor deliberately slows down to protect itself, a process called thermal throttling. Dust buildup in vents and fans, a laptop sitting on a blanket or pillow, or a desktop pushed against a wall can all trap heat.

• Use laptops on a hard, flat surface so air can flow underneath.
• Keep vents clear and give desktop towers some breathing room on all sides.
• Gently clean visible dust from vents with a soft brush or short bursts of compressed air while the computer is turned off and unplugged.
• Listen for a fan that runs loudly all the time, which suggests the system is struggling to stay cool.

Avoid opening a laptop’s case unless you are comfortable doing so and it will not void your warranty. For deep cleaning inside a laptop, a repair shop or the manufacturer’s service center is the safer choice.

When the basics are not enough

Fix 12: Consider a reset or an affordable upgrade

If you have tried everything above and the computer is still sluggish, two bigger options remain. The first is resetting the operating system to a clean state. Both Windows and macOS include built-in ways to reinstall the system, which removes years of accumulated clutter. On Windows, look under Settings, then System, then Recovery. On a Mac, the process depends on the model; Apple’s support documentation explains how to erase and reinstall for your specific machine. Back up everything first, because a full reset can erase your files and apps.

The second option is a hardware upgrade. On many desktops and some older laptops, adding more memory or replacing a hard disk with a solid-state drive can make an older machine feel new again for a fraction of the price of a replacement. Many recent laptops, including most current Macs, have memory and storage built directly onto the main board, so upgrades are not possible. Check your exact model’s specifications before buying any parts, or ask a reputable repair shop for advice.

Quick reference: where to find each tool

Common mistakes to avoid

• Downloading “PC cleaner” or “Mac cleaner” apps from ads. Many of these exaggerate problems to sell you a subscription, and some bundle unwanted software. The built-in tools do the same job safely.
• Using registry cleaners on Windows. Microsoft does not support them, and editing the registry carelessly can cause serious problems with no meaningful speed gain.
• Deleting files you do not recognize from system folders. If you did not put a file there, leave it to the operating system’s own cleanup tools.
• Disabling your antivirus to “save resources.” The protection is worth the small performance cost.
• Skipping the backup before big changes. Always back up before resetting, upgrading the operating system, or replacing a drive.
• Running several security tools at once. Two real-time antivirus programs can conflict and slow your system considerably. Pick one.

Frequently asked questions

How often should I restart my computer?

Once a week is a good rule of thumb for most people, and any time you notice things feeling sluggish. Restarting also lets updates finish installing, which many systems need to complete their work.

Do Macs need antivirus software?

Macs include built-in malware protections that update along with the system, and for many home users those are sufficient when combined with careful habits, such as installing apps only from the App Store or known developers. The most important step is keeping macOS up to date.

Will more memory always make my computer faster?

Not always. More memory helps if you regularly run out of it, which you can confirm in Task Manager or Activity Monitor. If memory use is comfortably below the maximum, adding more will not change much, and the bottleneck is more likely the drive, the processor, or background software.

When is it time to replace my computer instead?

Consider replacing it when it can no longer receive security updates for its operating system, when repairs or upgrades would cost close to the price of a new machine, or when it simply cannot run the programs you need even after a clean reset. Until then, the fixes above often add years of useful life.

The bottom line

A slow computer is usually a crowded computer, not a dying one. Restart regularly, keep the startup list short, clear out apps and files you no longer need, stay current on updates, and keep the machine cool. Do those things with the free tools already built into Windows and macOS, and most computers will feel noticeably faster without spending a cent on software.