Most “slow PC” misery is not age — it is accumulation: dozens of programs auto-starting, a nearly-full drive, and one misbehaving app eating resources in the background. Work through these in order; stop when it feels right again.
1. Restart properly (do not skip)
Use Restart, not Shut down then power on — with Fast Startup enabled, only Restart fully reloads Windows. A weekly restart cures a surprising share of sluggishness.
2. Cut startup apps
Settings → Apps → Startup. Turn off everything you do not need in the first minute after login — chat apps, game launchers, updaters, vendor “helpers”. This is the single biggest everyday speedup for most machines. (Task Manager → Startup apps shows the same list with impact ratings.)
3. Free up disk space — drives hate being full
Windows needs roughly 10–15% of the system drive free to breathe. Settings → System → Storage shows what is big; enable Storage Sense to auto-clean temp files, empty the recycle bin, and run the cleanup recommendations offered there. Move big video/photo folders to an external drive or cloud.
4. Find the app eating your machine
Open Task Manager (Ctrl+Shift+Esc) → Processes, sort by CPU, then Memory, then Disk. One app pinned near 100% is your culprit: update it, reinstall it, or replace it. A browser with 60 tabs regularly tops this list — close tabs or use the browser's sleeping-tabs feature (Edge has it built in; Chrome calls it Memory Saver).
5. Turn off visual effects you will not miss
Search Start for “Adjust the appearance and performance of Windows” → choose Adjust for best performance, then re-enable only “Smooth edges of screen fonts” if text looks rough. On older hardware this is immediately visible.
6. Set the power plan to Best performance
Settings → System → Power & battery → Power mode → Best performance. On laptops this trades battery life for speed — plug in when you choose it.
7. Update Windows and drivers
Settings → Windows Update → Check for updates, including “Advanced options → Optional updates” where driver updates hide. Graphics drivers from NVIDIA/AMD/Intel's own apps matter most for stutter.
8. Scan for malware once
Windows Security → Virus & threat protection → Scan options → Full scan. Adware that arrives bundled with free downloads is a classic hidden cause of slowness and fan noise.
9. Know when it is hardware
If the drive is a spinning hard disk (Task Manager → Performance shows “HDD”), an SSD upgrade is the one hardware change that makes an old PC feel new — typically a few hundred dollars installed, or less as a DIY. If RAM sits above 90% in normal use with 8 GB installed, a move to 16 GB is the other honest fix. Software cannot cure either.