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How to speed up a slow laptop: 14 fixes that actually work
Restart, update, stop startup apps, free up disk space, remove bloatware, check for malware and add RAM or an SSD. Free Windows and Mac fixes first, upgrades last.
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Quick answer: Start with the free fixes: restart, install updates, turn off startup apps (Task Manager → Startup apps), free up disk space (keep 15–20% free), uninstall apps you don't use, close extra browser tabs and extensions, use the Balanced or Best performance power mode, and scan for malware. If it's still slow, the biggest upgrades are a hard disk → SSD swap and more RAM (16 GB). On a very old laptop, a clean reinstall or a new machine may be the real fix.
Key takeaways
- Restarting fixes more slowness than any "PC cleaner" app.
- Startup apps are the most common cause of slow boot times.
- A full disk slows everything — keep at least 15–20% free.
- SSD upgrade is the single biggest speed boost for laptops still on a hard drive.
- Avoid "registry cleaner" and "RAM booster" apps — they rarely help and some are malware.
A slow laptop is frustrating, but the cause is usually simple: too much running at once, too little space, or old hardware. Work through these fixes in order — the first ones take minutes and cost nothing.
First, find out what's slowing it down
Windows: press Ctrl + Shift + Esc to open Task Manager → Processes. Sort by CPU, Memory and Disk.
Mac: open Activity Monitor (Applications → Utilities) and check the CPU, Memory and Disk tabs.
| What you see | Likely cause | Go to fix |
|---|---|---|
| Disk at 100% for minutes | Hard drive (HDD), updates, or indexing | #3, #4, #13 |
| Memory 85%+ most of the time | Too many apps/tabs, or only 4–8 GB RAM | #6, #7, #12 |
| CPU high with nothing open | Background apps, malware, or updates | #2, #5, #9 |
| Slow only when unplugged | Power saving mode | #8 |
| Slow and hot, fans loud | Dust, blocked vents, or thermal throttling | #10 |
Free fixes (do these first)
1. Restart properly
A restart clears memory and finishes pending updates. On Windows, Shut down with Fast Startup on doesn't fully clear everything — use Restart instead. Restart at least once a week.
2. Install updates
- Windows: Settings → Windows Update → Check for updates. Also check Optional updates for drivers.
- Mac: System Settings → General → Software Update.
- Update your browser and key apps too.
Still on Windows 10? See Windows 10 end of support.
3. Turn off startup apps
- Windows 11: Settings → Apps → Startup, or Task Manager → Startup apps. Turn off anything you don't need the moment you log in — chat apps, game launchers, updaters, cloud apps you rarely use.
- Mac: System Settings → General → Login Items & Extensions.
Tip: Keep your antivirus, touchpad/audio drivers and cloud sync (if you rely on it) — turn off the rest. Look at the "Startup impact" column and start with "High".
4. Free up disk space
Keep at least 15–20% of your drive free.
- Windows: Settings → System → Storage → turn on Storage Sense, then open Temporary files and Cleanup recommendations.
- Empty the Recycle Bin and Downloads folder.
- Move photos and videos to an external drive or cloud.
- Mac: System Settings → General → Storage → review recommendations.
5. Uninstall apps you don't use
Many laptops come with bloatware — trial antivirus, games, manufacturer tools.
- Windows: Settings → Apps → Installed apps → sort by size or date.
- Mac: drag unused apps from Applications to the Bin.
Running two antivirus programs at once is a common cause of slowness. Keep one — Windows' built-in Microsoft Defender is enough for most people.
6. Tame your browser
The browser is usually the biggest memory user.
- Close tabs you don't need, or use tab groups and bookmarks.
- Turn on Memory Saver (Chrome) or Sleeping tabs (Edge).
- Remove extensions you don't use — each one uses memory and some slow every page.
- Clear the cache only if a site misbehaves; it doesn't usually speed things up.
7. Close background apps
Check the system tray (bottom-right on Windows) and menu bar (Mac) for apps running quietly — sync tools, launchers, RGB lighting software, chat apps. Quit or set them not to start automatically.
8. Use the right power mode
- Windows 11: Settings → System → Power & battery → Power mode → Balanced or Best performance while plugged in.
- Mac: System Settings → Battery → turn off Low Power Mode when you need speed.
9. Scan for malware
- Windows: Windows Security → Virus & threat protection → Quick scan, then Scan options → Microsoft Defender Offline scan if you suspect something.
- Look for unknown programs in Installed apps and unknown browser extensions.
10. Clean vents and keep it cool
Dust and blocked vents cause thermal throttling — the CPU slows down to avoid overheating.
- Use the laptop on a hard, flat surface, not a bed or pillow.
- Blow out vents gently with compressed air (laptop off).
- A cheap cooling stand helps in hot rooms.
11. Turn off visual effects (older laptops)
- Windows: search "Adjust the appearance and performance of Windows" → choose Adjust for best performance, then re-enable "Smooth edges of screen fonts".
- Turn off transparency effects in Settings → Personalization → Colors.
Upgrades that make a big difference
12. Add more RAM
If memory is often above 85%:
| Current RAM | Upgrade to | Typical difference |
|---|---|---|
| 4 GB | 8–16 GB | Night and day |
| 8 GB | 16 GB | Smooth multitasking |
| 16 GB | 32 GB | Only for heavy work |
Check first: many thin laptops have soldered RAM that can't be upgraded. Tools like Crucial System Scanner or your laptop's manual tell you what fits.
13. Replace a hard disk with an SSD
If your laptop still has a spinning hard drive (HDD), an SSD is the biggest single upgrade — boot times drop from minutes to seconds.
- Check in Task Manager → Performance → Disk — it says "SSD" or "HDD".
- A SATA SSD fits most older laptops; newer ones take M.2 NVMe drives.
- Clone your old drive with free tools from the SSD maker, or do a clean install.
14. Reset or reinstall the operating system
If years of apps and settings have piled up:
- Windows: Settings → System → Recovery → Reset this PC → "Keep my files" (back up anyway).
- Mac: use Erase All Content and Settings (on supported Macs) after backing up with Time Machine.
When to replace instead
Consider a new laptop if it's 6–8+ years old, has soldered 4–8 GB RAM, can't run Windows 11, or the battery and screen are failing too. Our laptop buying guide explains which specs to get.
Things that don't help (or make it worse)
- "PC cleaner", "registry cleaner" and "RAM booster" apps — little benefit; some show fake warnings or install adware.
- Defragmenting an SSD — not needed (Windows optimises SSDs automatically).
- Disabling Windows Defender to "save resources" — risky and gains little.
- Turning off Windows Update — you lose security fixes and performance improvements.
Frequently asked questions
Why is my laptop so slow suddenly?
Common causes are a large update running in the background, a new startup app, a full disk, too many browser tabs, or malware. Check Task Manager first.
Does more RAM make a laptop faster?
Yes, if your laptop regularly uses most of its RAM. If memory use is low, more RAM won't help.
Is an SSD upgrade worth it?
If your laptop has a hard disk, absolutely — it's the biggest speed improvement you can buy.
How much free space should my laptop have?
At least 15–20% of the drive.
Will a factory reset speed up my laptop?
Often, yes, because it removes years of apps, files and settings. Back up first.
Do I need a PC cleaner app?
No. Windows and macOS have built-in tools for storage and startup apps.
Why is my laptop slow on battery?
Power-saving modes reduce performance. Switch to Balanced or Best performance when you need speed.