How to Clean Up Your Computer to Make It Faster

This guide walks you through the essential steps to clean up your computer and boost its speed—freeing up storage, disabling startup bloat, and clearing out junk files that slow everything down. You’ll need about 30 minutes, a stable internet connection for updates, and administrator access to your machine.

What You’ll Need

• Administrator account on your computer
• Stable internet connection (for Windows/Mac updates)
• An external drive or cloud storage for backing up files (optional but recommended)
• Patience—do not rush the steps

Step-by-Step

1. Back up your important files. Before making any changes, copy documents, photos, and other irreplaceable files to an external drive or cloud service. This protects you if something goes wrong.
2. Restart your computer. A simple reboot clears the memory (RAM) and stops background processes that may be hogging resources. Save your work, then restart.
3. Uninstall programs you don’t use. Go to Settings > Apps > Apps & features on Windows, or open Finder > Applications on Mac. Sort by size and remove anything you haven’t used in months. This frees up storage and reduces background services.
4. Disable startup programs. On Windows, open Task Manager (Ctrl+Shift+Esc), go to the Startup tab, and disable anything you don’t need at boot. On Mac, go to System Settings > General > Login Items and remove unnecessary items. This speeds up boot time and frees memory.
5. Clean up temporary files. Use the built-in Disk Cleanup (Windows) by typing “Disk Cleanup” in the Start menu, selecting your drive, and checking “Temporary files” and “Recycle Bin.” On Mac, use Storage Management (Apple menu > About This Mac > Storage > Manage) and click “Optimize” or “Reduce Clutter.”
6. Run a disk cleanup for system files. In Disk Cleanup, click “Clean up system files” to remove old Windows updates and temporary system files. On Mac, empty the trash and clear caches via Finder (Go > Go to Folder, type ~/Library/Caches, and delete contents—but only if you’re comfortable).
7. Check for malware. Use Windows Security (built-in) or Malwarebytes (free version) to run a full scan. Malware can slow down your computer significantly. Remove anything found.
8. Update your operating system and drivers. Go to Settings > Update & Security > Windows Update (Windows) or System Settings   General > Software Update (Mac). Install all pending updates, as they often include performance fixes.
9. Manage your browser extensions. Open your browser’s extension manager and remove any extensions you don’t use. Too many extensions consume memory and slow down page loading.
10. Defragment your hard drive (Windows only). If you have a traditional HDD (not an SSD), open Defragment and Optimize Drives from the Start menu, select your drive, and click “Optimize.” This reorganizes data so the drive works faster. Skip this if you have an SSD—it’s unnecessary and can wear it out.
11. Clear your browser cache. In Chrome, press Ctrl+Shift+Del (Windows) or Cmd+Shift+Delete (Mac), choose “All time,” and clear cached images and files. This frees up space and can speed up browsing.
12. Restart again. After all changes, restart your computer one more time to ensure everything is applied cleanly.

Common Mistakes

• Skipping the backup. Deleting files without a backup can lead to permanent loss of important data.
• Disabling essential startup items. Do not disable antivirus or security software—this leaves you vulnerable.
• Using third-party “cleaner” tools. Many are unnecessary and can cause more harm than good. Stick to built-in tools.
• Defragmenting an SSD. This reduces the lifespan of solid-state drives and provides no speed benefit.
• Deleting system files you don’t understand. Only delete files that are clearly temporary or from apps you recognize.

Tips

• Keep at least 15% of your hard drive free. Windows and Mac need space for virtual memory and temporary files.
• Use cloud storage (OneDrive, Google Drive, iCloud) to offload files you rarely access.
• Schedule regular cleanups—do this every 3-6 months to maintain speed.
• Consider upgrading RAM if your computer still feels slow after cleanup—it’s often the biggest bottleneck.
• Use the “Storage Sense” feature on Windows (Settings > System > Storage) to automatically delete temp files.

Troubleshooting

• If your computer is still slow after cleanup: Check if your hard drive is nearly full. If so, move large files to an external drive. Also, check Task Manager (Windows) or Activity Monitor (Mac) to see what’s using CPU/RAM—you may need to close a resource-hungry app.
• If you accidentally delete a needed file: Check the Recycle Bin (Windows) or Trash (Mac) and restore it. If you don’t have a backup, you may need to use file recovery software, but this is not always successful.
• If a program won’t uninstall: Use the program’s own uninstaller (usually found in the Start menu folder or Applications). If that fails, try a dedicated uninstaller like Revo Uninstaller (free version), but be cautious.
• If Windows Update gets stuck: Run the Windows Update Troubleshooter (Settings > Update & Security > Troubleshoot > Additional troubleshooters). Restart and try again.
• If your Mac is still slow: Check for “kernel_task” using high CPU in Activity Monitor—this is often due to overheating. Close apps that generate heat and ensure proper ventilation.

Frequently Asked Questions

Will cleaning up my computer delete my personal files?

No, the steps above only remove temporary files, unused programs, and browser cache. Your personal documents, photos, and downloads remain untouched—unless you explicitly delete them.

How often should I clean up my computer?

A light cleanup (temp files, browser cache) can be done monthly. A full cleanup (uninstalling unused apps, checking startup) is best every 3-6 months.

Is it safe to use third-party cleaning software?

Generally, it’s safer to stick with built-in tools. Many third-party cleaners are unnecessary, may contain adware, or can delete important files. If you do use one, choose a reputable brand and read reviews.

Do I need to defragment my SSD?

No. SSDs do not benefit from defragmentation, and it can shorten their lifespan. Windows automatically disables defragmentation for SSDs, but if you have a manual tool, skip it.

Why is my computer slow even after cleaning?

Possible causes: insufficient RAM, an aging hard drive (consider upgrading to an SSD), too many background processes, or hardware that’s simply too old for your current software. Check Task Manager/Activity Monitor to identify the bottleneck.

Can I clean up my computer without administrator access?

You can perform some steps (like clearing browser cache) without admin rights, but uninstalling programs and disabling startup items typically require administrator privileges. If you’re on a work computer, contact your IT department.

Related

• Track Windows Computer & User Activity
• Right Click Not Working on Mac? Fixes That Work
• How to Type in Korean on Windows: Full Setup