About half the "my computer is so slow" machines that come across my bench don't need a single new part. They need a restart, some cleanup, and a few settings changed. Here's what I check first, in the order I check it.
1. Actually restart it
Closing the lid or clicking Shut Down isn't always a full restart. Windows often uses a feature called Fast Startup, which saves part of the system to disk instead of fully shutting down. Leftover processes and memory leaks carry over from day to day.
Click Start, then Power, then Restart. Restart is a true reset. If the computer feels noticeably faster afterward, make a weekly restart a habit.
2. Cut down what starts with Windows
Every app that launches at startup eats memory and slows boot time. Printers, game launchers, chat apps, and updaters love to add themselves.
- Press Ctrl + Shift + Esc to open Task Manager.
- Open Startup apps.
- Look at the Startup impact column and disable anything marked High that you don't need the moment you sign in.
Disabling a startup app doesn't uninstall it. It just stops it from launching on its own, and you can still open it whenever you want.
3. Check whether something is hogging the computer
Still in Task Manager, open Processes and click the CPU, Memory, and Disk column headers to sort by each one. If a single program sits near the top while you're doing nothing, that's your culprit.
4. Free up storage and run updates
Windows slows down when the main drive is nearly full. Open Settings, then System, then Storage to see what's using space, and turn on Storage Sense so Windows clears temporary files on its own.
Then open Windows Update and install everything waiting, including optional driver updates. Outdated graphics and chipset drivers cause more slowdowns and crashes than most people expect.
5. Scan for malware
Adware and hidden crypto miners run quietly in the background and use your processor for someone else's benefit. Open Windows Security, go to Virus & threat protection, and run a Full scan. It takes a while, so start it before bed.
While you're at it, open Settings, then Apps, then Installed apps and uninstall anything you don't recognize or no longer use, especially browser "helpers" and system optimizer programs you didn't choose to install.
When it's time for a pro
If you've done all five and the computer is still slow, it's usually hardware:
- An old hard drive. Swapping to an SSD is the single biggest speed upgrade for a computer more than a few years old. It often makes an old machine feel new.
- Not enough memory. 8 GB is the practical minimum for Windows 11 with a browser full of tabs. 16 GB is comfortable.
- Overheating. A computer clogged with dust slows itself down to stay cool. A cleaning and fresh thermal paste can bring back a surprising amount of speed.
Each of those is a quick fix at the bench, and none of them requires replacing the whole computer.