A slow PC is rarely a hardware problem — it's a clutter problem. Software accumulates: startup programs, background processes, browser extensions, and full drives. These 18 fixes clear all of it, and every single one is free.
1. Stop things running at startup
Open Task Manager (Ctrl+Shift+Esc) → Startup tab. Disable everything you don't need at boot — updaters, chat apps, media helpers. Most PCs have 10+ programs launching that only one or two are actually needed. This is the single biggest free speedup.
2. Actually restart the PC
Modern PCs use "shutdown" as a hybrid sleep, so months of memory leaks accumulate. A full restart (Shift + Restart, or Restart from the Start menu) clears memory and fixes a surprising share of slowdowns.
3. Free up disk space
Windows' built-in Disk Cleanup (or Storage Sense) removes temp files, old updates, and thumbnails. If your drive is over 90% full, performance tanks — aim for 15% free. No paid cleaner needed.
4. Tame the browser
- Kill extensions you don't use — each one runs on every page load.
- Clear the cache once a month (Settings → Privacy → Clear browsing data).
- Close old tabs — 50 open tabs is 50 live processes.
- Reset the browser if it's been years — Settings → Reset keeps bookmarks.
5. Install pending updates
Windows and driver updates include performance and security fixes. A PC sitting on old updates runs slower and less safely. Let updates finish overnight.
6. Close background bloat
In Task Manager → Processes, sort by Memory and close the biggest non-essential items you recognize (old video editors, torrent clients, chat apps). You can't break anything — worst case, Windows restarts the program.
7. Check your power plan
On laptops, "Battery saver" or "Power saver" throttles performance. For plugged-in work, switch to a balanced or high-performance plan (Settings → Power). Instant difference in responsiveness.
8. Run a free malware scan
Cryptocurrency miners and adware quietly eat your CPU. Windows Defender (built-in, free) full scan catches the usual suspects.
9. Rebuild the search index
A corrupted or bloated Windows search index makes File Explorer and search slow. Settings → Search → Search indexing → Advanced → Rebuild. Free, takes a few minutes, often dramatic.
10. The five-minute quick wins
- Uninstall programs you forgot you had (Apps → Installed apps, sorted by size).
- Run a disk check (
chkdskfrom an admin terminal) if files behave oddly. - Turn off visual effects (System → Advanced system settings → Performance → Adjust for best performance).
- Check for a second RAM slot free — adding a stick is the cheapest real upgrade, but that's the only item here that costs money.
What to expect
| Fix | Typical impact |
|---|---|
| Startup cleanup | Boots 30–60% faster |
| Browser reset | Loading feels 2–3x snappier |
| Disk space | No more freezing at 95% full |
| Restart + updates | Eliminates most "random" slowdowns |