Start with the simplest fixes first

A slow computer usually does not need new hardware. Most of the time, you can speed it up by closing programs you are not using, clearing out old files, and stopping unnecessary software from running at startup. These changes take an hour or two and cost nothing.

The reason your computer slows down is that it is trying to do too many things at once. Every program running in the background uses memory and processing power. Every file on your hard drive takes up space that the system has to search through. Every startup program loads before you even open your browser. Removing the clutter addresses all three.

Key Takeaways

  • Close programs running in the background and disable startup programs to free up memory and processing power when ready.
  • Delete old files, empty your recycle bin, and clear your browser cache to recover hard drive space and speed up file searches.
  • Check your hard drive storage — if it is more than 80 percent full, your computer will slow down noticeably.
  • Restart your computer regularly to clear temporary files and reset memory usage.
  • If your computer is still slow after these steps, a failing hard drive or overheating may be the cause, and you should have it checked by a technician.

Close background programs and disable startup items

Every program running in the background uses memory. On Windows, open Task Manager by pressing Ctrl+Shift+Esc. Look at the Processes tab and sort by Memory to see which programs are using the most. Close any you do not need right now — your browser, email, music apps, and messaging services all run in the background by default.

Next, stop programs from launching automatically when you start your computer. On Windows 10 or 11, open Task Manager, click the Startup tab, and right-click any program you do not use every day. Select Disable. On a Mac, go to System Settings, General, Login Items, and remove programs from the list. Be careful not to disable anything you do not recognize — if you are unsure, leave it alone or search the program name online first.

Restarting your computer after making these changes clears temporary files and resets memory usage. A restart alone often makes a noticeable difference, especially if your computer has been running for days or weeks without shutting down.

Delete files and clear your browser cache

Your hard drive slows down when it gets full. If your drive is more than 80 percent full, your computer has to work harder to find and organize files. Check how much space you have left by opening File Explorer on Windows or Finder on a Mac, right-clicking your main drive, and selecting Properties or Get Info.

Start by deleting files you no longer need. Look in your Downloads folder — most people accumulate months of old installers and documents there. Delete old photos, videos, and documents you have backed up elsewhere. Empty your Recycle Bin (Windows) or Trash (Mac) to actually remove the files from your drive.

Clear your browser cache next. This is temporary data your browser stores to load websites faster, but it builds up over time. On Chrome, Firefox, or Edge, press Ctrl+Shift+Delete (Windows) or Command+Shift+Delete (Mac), select All Time, check Cached Images and Files, and click Clear Data. This usually frees up several gigabytes.

Check for malware and viruses

Malware and viruses run in the background and consume resources without your knowledge. They also slow your computer by redirecting your internet connection or constantly accessing your hard drive. If your computer suddenly became slow, malware is a common cause.

On Windows, run a scan with Windows Defender, which is built in. Open Windows Security, click Virus and Threat Protection, and select Scan Options. Choose Full Scan and let it run — this takes 30 minutes to an hour. On a Mac, read and run Malwarebytes, which is free for a single scan. If either tool finds something, remove it and restart your computer.

Update your operating system and drivers

Operating system updates often include performance improvements and bug fixes that speed up your computer. Check for updates on Windows by going to Settings, Update and Security, and clicking Check for Updates. On a Mac, go to System Settings, General, and Software Update. Install any available updates and restart.

Outdated drivers — the software that controls your hardware — can also slow your system. On Windows, open Device Manager, look for any devices with a yellow warning icon, right-click them, and select Update Driver. On a Mac, drivers usually update automatically with the operating system.

Increase available storage space

If your hard drive is nearly full and you cannot delete more files, you need more storage. An external hard drive or cloud storage service like Google Drive or OneDrive can hold old files you want to keep but do not use often. Move large files like old photos and videos to external storage, then delete them from your computer.

If you have a lot of files you need to keep on your computer, consider upgrading to a larger hard drive or a solid-state drive (SSD). An SSD is faster than a traditional hard drive and will noticeably speed up your computer, but this requires opening your computer or taking it to a technician. This is the most expensive option on this list, but it is also the most effective if your drive is genuinely full.

Adjust visual effects and power settings

Windows and Mac both use visual effects like animations and transparency that look nice but use processing power. On Windows, right-click This PC or My Computer, select Properties, click Advanced System Settings, and go to the Advanced tab. Under Performance, click Settings and select Adjust for Best Performance. This turns off most visual effects. On a Mac, go to System Settings, Accessibility, Display, and turn on Reduce Motion and Increase Contrast.

Check your power settings as well. On Windows, open Settings, System, Power and Battery, and make sure you are not in Power Saver mode, which limits your processor speed. On a Mac, go to System Settings, Battery, and check that your Mac is not in Low Power Mode. These modes extend battery life on laptops but slow down performance.

When to call a technician

If your computer is still slow after trying these steps, the problem may be hardware-related. A failing hard drive, overheating, or a faulty memory module (RAM) can cause slowness that software changes will not fix. Signs of hardware failure include grinding or clicking sounds from inside the computer, unexpected shutdowns, or a fan that runs constantly and loudly.

Take your computer to a technician if you hear unusual sounds, if it shuts down without warning, or if it overheats even when you are not running demanding programs. A technician can run diagnostic tests to identify the problem and replace hardware if needed. This costs more than the fixes above, but it is necessary if the hardware itself is failing.

Frequently Asked Questions

How often should I restart my computer?

Restart at least once a week, or daily if you leave your computer on all the time. A restart clears temporary files and resets memory, which keeps your computer running smoothly. If your computer is slow, try restarting before trying anything else.

Is it safe to disable programs in the Startup tab?

Yes, as long as you do not disable anything you do not recognize. Most startup programs are safe to disable — your antivirus, Windows Update, and a few others should stay on. If you disable something and your computer stops working the way you expect, go back to Task Manager and re-enable it.

Will adding more RAM make my computer faster?

Yes, if your computer is running out of memory. Open Task Manager on Windows and look at the Memory tab while you are using your computer normally. If Memory Usage is consistently above 80 percent, adding RAM will help. If it stays below 60 percent, RAM is not your bottleneck.

What is the difference between clearing cache and deleting files?

Cache is temporary data your browser stores automatically to load websites faster. Deleting cache frees up space but does not affect your files or passwords. Deleting files removes documents, photos, and programs you have chosen to delete. You can safely clear cache anytime, but be careful when deleting files.

Can I speed up my computer without restarting?

Closing background programs and clearing cache will help without restarting, but a restart is more effective because it clears all temporary files at once. If you cannot restart right now, close your browser and any programs you are not using, and you should see some improvement.