The fastest fixes work on the things slowing you down right now

A slow computer usually isn't slow everywhere at once. It's slow when you open your browser, or when you switch between programs, or when you first turn it on. Finding which one is the problem cuts your work in half. Start by noticing when the slowness happens, then work through the fixes that match that moment. Most people see a real difference within an hour by closing background programs, clearing temporary files, and restarting their machine.

The fixes below work on Windows and Mac. Some steps look slightly different depending on your operating system, but the idea is the same: you're removing clutter, stopping programs from running when you don't need them, and giving your computer room to breathe.

Key Takeaways

  • Restart your computer first—it clears temporary files and stops programs from piling up in memory, and solves slowness about 40 percent of the time.
  • Close programs running in the background that you don't use, especially web browsers with many tabs open, because they consume memory and processing power.
  • Delete temporary files and browser cache using built-in tools, which can free up gigabytes of space and speed up file searches.
  • Check your hard drive's free space; if you have less than 10 percent free, your computer slows down because it has nowhere to write temporary data.
  • Update your operating system and drivers, because updates often include fixes that improve performance and close security gaps that slow your machine.

Restart your computer and notice what changes

Restarting is the single most effective first step, and it takes five minutes. When your computer restarts, it clears out the temporary files programs create while running, closes any background processes that got stuck, and resets your memory. Many slowness problems vanish after a restart because the issue was not your hardware—it was programs piling up.

After you restart, pay attention to what's different. Is the computer fast when you first turn it on but slow down after an hour? That tells you something is running in the background. Is it slow only when you open your browser? That's a browser problem, not a whole-computer problem. Is it slow when you open large files like videos or spreadsheets? That's a storage or memory issue. Knowing which moment is slow helps you pick the right fix.

Close programs running in the background

Programs keep running even when you're not looking at them. Your web browser with 20 tabs open is using memory. Your email client is checking for new messages. Your antivirus is scanning files. Your cloud storage is syncing. Each one is small, but together they add up. On Windows, you can see what's running by opening Task Manager: press Ctrl+Shift+Esc, click the Processes tab, and look at the Memory column. On Mac, open Activity Monitor (search for it in Spotlight), click the Memory tab, and look at the Memory column.

Start by closing your web browser completely and reopening it with fewer tabs. A browser with 30 tabs can use as much memory as several other programs combined. If you need those tabs later, save them as a bookmark folder instead. Next, look at programs you don't recognize or don't use every day. Right-click them and choose End Task (Windows) or click the X button (Mac). Don't close anything labeled System or Windows—those are part of your operating system. If you're not sure what something is, search for its name online before closing it.

Delete temporary files and clear your browser cache

Your computer stores temporary files while you work—copies of web pages you visited, fragments of files you edited, installation leftovers. Over months, these pile up and take up space. Clearing them out can free several gigabytes and speed up file searches. On Windows, open Settings, go to System, then Storage, and click Temporary Files. Check the boxes for Temporary Files, Recycle Bin, and Downloads (if it's empty), then click Delete. On Mac, open Finder, click Go in the menu bar, press Command+Shift+G, type ~/Library/Caches, and delete the contents of that folder (or use a free tool like CleanMyMac X Lite if you want a simpler interface).

Your web browser also stores copies of every web page you visit so it loads faster next time. This cache builds up quickly. In Chrome, Firefox, or Edge, press Ctrl+Shift+Delete (Windows) or Command+Shift+Delete (Mac), choose All Time, check Cookies and Cached Images, and click Clear Data. In Safari, go to History in the menu bar, click Clear History, choose All History, and click Clear History. Clearing your cache will make some websites load slightly slower the first time you visit them, but your overall computer will be faster.

Check how much free space your hard drive has

Your computer needs empty space to write temporary files while you work. If your hard drive is more than 90 percent full, your computer slows down noticeably because it's struggling to find room. On Windows, right-click your C: drive in File Explorer and click Properties. On Mac, click the Apple menu, go to About This Mac, and click Storage. If you have less than 10 percent free space, you need to delete files or move them to an external drive.

Start by deleting files you don't need: old downloads, duplicate photos, videos you've already watched. Move large files like video projects or photo libraries to an external hard drive or cloud storage. If you're still full, uninstall programs you don't use. On Windows, go to Settings, Apps, Apps & Features, find a program you don't need, and click Uninstall. On Mac, open Applications, drag unused programs to the Trash, and empty the Trash. Getting your free space above 20 percent usually makes a noticeable difference.

Update your operating system and drivers

Operating system updates include performance improvements, security fixes, and driver updates all at once. A driver is software that lets your computer talk to hardware like your graphics card or network adapter. Outdated drivers can cause slowness or crashes. On Windows, go to Settings, Update & Security, and click Check for Updates. Let it install everything and restart if prompted. On Mac, go to System Preferences, Software Update, and click Update Now. These updates can take 30 minutes to an hour, so do them when you don't need your computer.

If you have a graphics card (especially if you play games or edit video), you may need to update its driver separately. NVIDIA and AMD both have driver read pages where you can find the latest version for your card. Installing the latest driver can improve performance in games and video editing by 10 to 20 percent. Check your graphics card model first: on Windows, right-click your desktop and look for NVIDIA Control Panel or AMD Radeon Settings. On Mac, go to About This Mac and look under Graphics.

Disable startup programs you don't need

Every time your computer starts, it launches programs automatically. Some are essential, but others slow down your startup time and run in the background all day. On Windows, press Ctrl+Shift+Esc to open Task Manager, click the Startup tab, and look at the Status column. Programs marked Enabled will start automatically. Right-click ones you don't need (like Spotify, Discord, or Slack if you don't use them first thing in the morning) and click Disable. On Mac, go to System Preferences, General, and look for Login Items. Select programs you don't need at startup and click the minus button to remove them.

Be careful not to disable anything you're not sure about. Windows Update, your antivirus, and your graphics driver should stay enabled. If you disable something and your computer stops working the way you expect, you can always re-enable it. Disabling unnecessary startup programs won't make your computer faster while it's running, but it will make it start up faster and free up memory for the programs you actually use.

Frequently Asked Questions

How much faster will my computer be after I do these steps?

That depends on what was slowing it down. If you had 50 browser tabs open and 20 background programs, you might see a 50 percent improvement. If your hard drive was 95 percent full, clearing space might make it twice as fast. If your computer was already clean, the improvement will be smaller. Restart first to see the biggest when ready change.

Will clearing my cache delete my passwords or login information?

No. Cache is just copies of web pages. Your passwords are stored separately in your browser's password manager. When you clear cache, you can choose what to delete. Uncheck Passwords and Autofill Data if you want to keep them, and only delete Cached Images and Cookies.

Is it safe to delete files from the Temp folder?

Yes. Temporary files are meant to be deleted. Windows and Mac both create new ones as needed. The only exception is if a program is currently using a temp file—which is rare. If you're nervous, restart your computer first, then delete temp files while nothing is running.

What if my computer is still slow after I do all of this?

Your hardware might be genuinely old or underpowered. Computers from 2010 or earlier will always be slow by today's standards, no matter how much you clean them. If your computer is less than five years old and still slow after these steps, your hard drive might be failing, or you might need more RAM. A technician can run diagnostics to check.

Do I need to buy software to speed up my computer?

No. The built-in tools in Windows and Mac do everything you need. Paid "cleaner" programs often don't do anything the free tools don't already do, and some can cause problems. Stick with Task Manager, Storage settings, and your browser's built-in cache clearing.