Computer Running Slow? 12 Easy Fixes to Speed Up Your PC

A slow computer doesn't always mean you need a new one. In most cases, a few targeted fixes can dramatically improve performance. This guide helps you identify your specific bottleneck — CPU, RAM, disk, or malware — and fix it with proven techniques.

Step 0: Identify the Bottleneck

Before trying random fixes, identify what's actually slow:

1. Press Ctrl + Shift + Esc to open Task Manager
2. Click Performance tab — look at CPU, Memory, and Disk
3. If CPU is at 100%: A process is hogging the processor → see Fix 2
4. If Memory is above 90%: You need to free RAM or upgrade → see Fixes 3-4
5. If Disk is at 100%: Your hard drive is the bottleneck → see Fixes 8-9
6. Mac: Open Activity Monitor (Spotlight → "Activity Monitor") for the same information

Fix 1: Restart Your Computer

This sounds obvious but genuinely works. Restarting clears temporary files, resets RAM, closes memory-leaking programs, and finishes pending updates. If you haven't restarted in days, do it now. Use Restart, not Shut Down in Windows 11/10 — Shut Down uses "Fast Startup" which doesn't fully reset the system.

Fix 2: Disable Startup Programs

Too many startup programs make booting slow and consume resources:

1. Press Ctrl + Shift + Esc → go to Startup tab (or Startup apps in Windows 11)
2. Look at the Startup impact column
3. Disable anything you don't need immediately at boot: Spotify, Discord, Teams, Adobe, OneDrive, Skype, Steam
4. Keep enabled: antivirus, graphics drivers, audio services
5. Mac: System Settings → General → Login Items → remove unnecessary entries

Fix 3: Close Resource-Hungry Programs

In Task Manager (Processes tab), click the Memorycolumn to sort by RAM usage. Chrome with many tabs is the usual culprit — each tab uses 100-500 MB. Close tabs you're not using. Other RAM hogs: Slack, Teams, Photoshop, VS Code with many extensions. If a process you don't recognize is using a lot of resources, search its name online — it might be malware.

Fix 4: Free Up Disk Space

Windows needs at least 10-15% free disk space to function well:

• Open Settings → System → Storage — see what's using space
• Click Temporary files → select all → Remove files
• Empty the Recycle Bin
• Uninstall programs you no longer use: Settings → Apps → Installed apps
• Use Disk Cleanup: search "Disk Cleanup" → select drive → check all boxes → "Clean up system files" for more space
• Move large files (photos, videos) to an external drive or cloud storage

Fix 5: Scan for Malware

Malware running in the background can consume CPU, RAM, and bandwidth. Run a full scan: Windows: Open Windows Security → Virus & threat protection → Scan options → Full scan. Also run Malwarebytes (free version) for a second opinion — it catches things Windows Defender misses. Mac: While Macs rarely get viruses, install Malwarebytes for Mac if you suspect an issue.

Fix 6: Update Windows/macOS

Outdated operating systems can have performance bugs that are fixed in updates. Windows: Settings → Windows Update → Check for updates → install all updates and restart. Mac: System Settings → General → Software Update. However, note that in-progress updates can temporarily slow your computer — if Windows Update is downloading in the background, let it finish.

Fix 7: Adjust Visual Effects (Windows)

Windows animations and visual effects consume resources. Disable them for a speed boost on older hardware: Search "Adjust the appearance and performance of Windows" → select "Adjust for best performance" or manually uncheck animations, shadow effects, and transparency. This makes a noticeable difference on computers with older CPUs or integrated graphics.

Fix 8: Fix 100% Disk Usage (Windows)

If Task Manager shows Disk at 100%, your hard drive can't keep up:

• Disable SysMain (Superfetch): services.msc → SysMain → Stop → set to Disabled
• Disable Windows Search indexing: services.msc → Windows Search → Stop → Disabled
• Check for disk errors: open Command Prompt as admin → chkdsk C: /f /r (requires restart)
• The permanent fix for 100% disk on an HDD: upgrade to an SSD

Fix 9: Upgrade to an SSD

If your computer has a traditional spinning hard drive (HDD), upgrading to a Solid State Drive (SSD) is the single most impactful upgrade. Boot time drops from minutes to seconds. Applications open instantly. Overall system responsiveness improves dramatically. A 500 GB SSD costs around $40-60 and can be installed by any computer repair shop, or you can do it yourself with a cloning tool.

Fix 10: Upgrade RAM

If Task Manager consistently shows Memory above 85-90%, you need more RAM. Check your current RAM: Settings → System → About → Installed RAM. If you have 4 GB, upgrade to at least 8 GB. If 8 GB, consider 16 GB. RAM upgrades are inexpensive ($20-50) and easy to install on most desktop PCs and many laptops.

Fix 11: Reset Windows (Last Resort)

If nothing else works and years of software buildup have made the computer unbearably slow: Settings → System → Recovery → Reset this PC → Keep my files. This reinstalls Windows while preserving your personal files but removes all installed applications. It gives you a "clean slate" and often makes an old computer feel new again.

Fix 12: Speed Up Mac

• Reduce Login Items: System Settings → General → Login Items
• Free storage: Apple menu → About This Mac → Storage → Manage
• Reduce transparency and motion: System Settings → Accessibility → Display → Reduce motion
• Reset SMC: Shut down → hold Shift + Control + Option + Power for 10 seconds (Intel Macs)
• For Apple Silicon Macs, simply restart — they don't have SMC