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Computer Running Slow? 10 Easy Fixes (No Tech Skills Needed)

Last updated: March 2026

A computer that used to work perfectly but now crawls along is one of the most common frustrations. The good news? You usually don't need to buy a new computer or pay for expensive repairs. Most slowness comes from software issues you can fix yourself in 20-30 minutes.

Let's walk through the fixes that work most often, starting with the easiest ones. We'll cover both Windows and Mac.

In This Guide:

  • How to stop programs from running at startup (biggest speed boost)
  • How to free up disk space that's slowing you down
  • How to check if your computer is overheating
  • When you actually need more RAM or an SSD upgrade
  • How to keep your computer running fast long-term

Fix #1: Disable Startup Programs (Windows)

Disable programs that start automatically when you turn on your computer. Over time, you accumulate dozens of these that use memory and processing power, making them the #1 cause of slow startups and sluggish performance.

Windows 10 and 11:

  1. 1. Press Ctrl + Shift + Esc to open Task Manager
  2. 2. Click the Startup tab
  3. 3. Look at the "Status" and "Startup impact" columns
  4. 4. For any program with "High" impact that you don't use daily, right-click it and select Disable
  5. 5. Common programs safe to disable: Spotify, Zoom, Adobe updaters, printer utilities
  6. 6. Restart your computer to see the improvement

Why This Works:

Disabling startup programs doesn't uninstall them — you can still open them manually when needed. It just stops them from running in the background all the time, freeing up memory and processor power for what you're actually using.

Fix #2: Disable Login Items (Mac)

Disable apps that auto-start when you log in on your Mac to prevent them from slowing everything down.

Steps:

  1. 1. Click the Apple menu → System Settings (or System Preferences on older Macs)
  2. 2. Click General → Login Items
  3. 3. Look at the list of apps that open when you log in
  4. 4. For apps you don't need immediately, select them and click the - button
  5. 5. Restart your Mac

Fix #3: Free Up Disk Space

Free up disk space if your hard drive is more than 80% full. Your computer needs empty space to work efficiently, and being over 80% full causes significant slowdown.

Windows Storage Cleanup:

  1. 1. Press Windows key and type "storage"
  2. 2. Click Storage settings
  3. 3. Turn on Storage Sense (this automatically cleans junk files)
  4. 4. Click Temporary files
  5. 5. Check the boxes, then click Remove files

Mac Storage Cleanup:

  1. 1. Click Apple menu → About This Mac
  2. 2. Click Storage
  3. 3. Click Manage
  4. 4. Use "Optimize Storage," "Empty Trash Automatically," and "Reduce Clutter" options
  5. 5. Review and delete large old files you don't need

Fix #4: Restart Your Computer

Restart your computer if you haven't done so in days or weeks. A simple restart clears out built-up temporary files and memory leaks.

Important: Choose "Restart," not "Shut down." A restart fully clears memory, while shut down on modern computers sometimes keeps things in memory for faster startup.

Fix #5: Update Your Operating System

Update your operating system to get performance improvements and bug fixes that can speed things up.

Windows:

Press Windows key → type "windows update" → click Check for updates

Mac:

Apple menu → System Settings → General → Software Update

Fix #6: Check for Malware

Scan for malware and unwanted software that can dramatically slow your computer by running in the background.

Windows:

  1. 1. Press Windows key → type "security"
  2. 2. Open Windows Security
  3. 3. Click Virus & threat protection
  4. 4. Click Quick scan

Fix #7: Close Browser Tabs

Close excess browser tabs if you keep 20+ open all the time. Every open tab uses memory, creating a huge drain on your system.

Quick Test:

Press Ctrl + Shift + Esc (Windows) to open Task Manager and look at how much memory your browser is using. If it's over 2GB, close some tabs.

Fix #8: Check for Overheating

Check if your computer is overheating, which causes it to automatically slow itself down to prevent damage.

Signs of Overheating:

  • • Computer feels very hot to touch (especially bottom of laptop)
  • • Fans running loudly all the time
  • • Computer is slower when it's been on for a while

How to Fix:

  • • Make sure vents aren't blocked (don't use laptop on soft surfaces like beds)
  • • Clean dust from vents with compressed air
  • • Use a laptop cooling pad if needed

Fix #9: Uninstall Programs You Don't Use

Uninstall programs you're not using to free up space and stop their background processes.

Windows:

Press Windows key → type "add or remove programs" → uninstall programs you don't recognize or use

Mac:

Open Finder → Applications → drag unused apps to Trash

Fix #10: Check If You Need a Hardware Upgrade

Determine if you need more RAM or an SSD upgrade when software fixes aren't enough. Here's how to know:

You Probably Need More RAM If:

  • • You have less than 8GB of RAM
  • • Computer is slow when you have multiple programs open
  • • Task Manager shows memory usage over 80% regularly

You Probably Need an SSD If:

  • • Your computer takes 2+ minutes to start up
  • • Programs take forever to open
  • • You still have a traditional hard drive (not an SSD)

Common Mistakes to Avoid

  • ✗Don't install "PC speedup" software: These programs often make things worse and try to sell you upgrades you don't need.
  • ✗Don't disable your antivirus: While it uses some resources, the security is worth it.
  • ✗Don't assume you need a new computer: Most slowness is fixable. Try all these fixes first.

How to Keep Your Computer Fast

  • ✓Restart weekly: Even if you don't think you need to. It clears out buildup.
  • ✓Keep at least 20% of your storage free: Don't let your drive get too full.
  • ✓Be selective about startuprograms: Only let essential programs start automatically.
  • ✓Close browser tabs you're not using: Bookmark them if you want to save them.

Computer Still Crawling After Trying These Fixes?

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Frequently Asked Questions

Why is my computer suddenly so slow when it used to be fast?

The most common causes are: too many programs starting automatically when you turn on your computer, not enough free disk space (your drive is over 80% full), accumulated temporary files and junk, or your computer is overheating and throttling itself to stay cool.

How do I stop programs from running when my computer starts up?

On Windows, press Ctrl+Shift+Esc to open Task Manager, click the Startup tab, right-click on programs with "High" impact that you don't use daily, and select "Disable." On Mac, go to System Settings → General → Login Items and remove apps you don't need immediately.

How do I clean up temporary files that are slowing things down?

On Windows, press the Windows key, type "storage," open Storage settings, and use Storage Sense to automatically clean temporary files. On Mac, go to About This Mac → Storage → Manage and use the optimize and reduce clutter options.

Could my computer be overheating?

Yes. Signs of overheating include: the computer feels very hot to touch (especially the bottom of a laptop), fans running loudly all the time, and slower performance after it's been on for a while. Fix it by making sure vents aren't blocked, cleaning dust from vents, and using your laptop on hard surfaces.

Do I need more RAM or a new hard drive?

You likely need more RAM if you have less than 8GB, your computer is slow with multiple programs open, or Task Manager shows memory usage over 80% regularly. You likely need an SSD upgrade if your computer takes 2+ minutes to start, programs take forever to open, or you still have a traditional hard drive instead of an SSD.