Most "speed up your PC" advice is a list of things that feel like work and change nothing: emptying a folder of temporary files, running a registry cleaner, disabling services you do not understand. This is the opposite. These five rungs are ordered by how much speed you get per pound spent, and almost everyone should start at rung one.
First, name the slowness
Before touching anything, answer three questions. The answers decide which rung you are on.
- When is it slow? Starting up, opening apps, browsing the web, or everything all the time?
- For how long has it been slow? A sudden change is a fault. A gradual decline is wear and accumulation.
- How old is the machine, and does it have an SSD? This is the single most important fact about a computer's speed.
Write the answers down. You will want them after each change, because "it feels faster" is not a measurement and it is easy to undo good work by accident.
Rung 1 — Free: stop the machine wasting its own time (0 minutes to an hour)
This rung fixes more computers than everything below it combined, and it costs nothing.
- Cut the startup list. Every program that launches with Windows delays the desktop and competes for memory afterwards. See the startup guide — this is the highest-value hour in this entire article.
- Restart properly. Open apps accumulate memory over days. A true restart (not shut down and on again, which with Fast Startup is closer to a deep sleep) clears it.
- Check for malware. Run a full scan with Microsoft Defender, built in and free. A machine that became slow suddenly, runs hot at idle, or spins the disk when idle is a candidate.
- Clear enough disk space. Below about 10–15% free, Windows has no room to work. Full drives slow down writes and updates.
- Update Windows and your graphics driver. Not for features — for the driver fixes that stop stutter and the security patches that stop the machine working against itself.
Rung 2 — Free: close the gap between what you do and what runs
- Uninstall what you do not use. Especially anything that came bundled, runs at startup, or you cannot identify. Ask before removing anything with "driver" or "security" in the name.
- Use fewer browser tabs, or let the browser sleep them. Most "the whole PC is slow" complaints are one browser with forty tabs.
- Turn off the extras you never asked for. Cloud sync clients for accounts you stopped using, RGB and fan software, printer utilities, "boost" tools that ship with peripherals.
Rung 3 — £35–£60: more memory
If the machine has 8 GB or less, this is the best value part you can buy. Windows plus a browser plus a couple of apps will use all of it, and once memory runs out the machine starts swapping to disk, which is exactly the "everything pauses when I click something" feeling.
Add enough to reach 16 GB in total. Follow the RAM upgrade guide for how to identify the right modules.
More memory does not make a fast machine faster. It stops a fast machine from behaving like a slow one. If you already have 16 GB and the machine is slow, skip to rung 4.
Rung 4 — £45–£110: a solid-state drive
This is the big one, and it is the reason a ten-year-old laptop can feel newer than a five-year-old one.
An SSD does not make the processor faster. It removes the waiting that sits between you and everything else: starting up, opening an app, loading a document, saving a file, waking from sleep. A hard drive from a slow machine typically boots in 60–90 seconds; the same machine on an SSD boots in 12–20.
If the machine still has a spinning hard drive and you only do one thing from this article, do this one. The SSD guide covers choosing the drive, cloning versus a clean install, and the laptop-versus-desktop differences.
Rung 5 — £150 and up: the upgrade that is really a replacement
Beyond the SSD there is processor, graphics card and motherboard — and this is where the arithmetic turns. A new CPU usually means a new motherboard, which means new memory. At that point you are building a new computer, and it is usually cheaper and far less trouble to buy one.
The honest exception is a desktop already built to be upgraded: a graphics card is a genuine, worthwhile upgrade if you play games or edit video, and it is a waste of money if you browse the web.
When to stop
Stop climbing when the cost of the next rung is more than about a third of what a replacement machine would cost, or when the machine has other problems — a worn battery, a failing hinge, a noisy fan, an unsupported operating system. Repairing a machine that will fail somewhere else next month is not a saving.
What to expect, honestly
| Rung | Cost | Typical gain | Who notices | | --- | --- | --- | --- | | Startup cleanup | Free | 10–40 s off every boot | Everyone | | Disk space and restarts | Free | Everything, on a full drive | Everyone | | Memory to 16 GB | £35–£60 | No more freezing with many apps | Multitaskers, browsers | | SSD | £45–£110 | 4–6× faster boot and app loads | Everyone, dramatically | | New CPU or laptop | £400+ | Modest for daily work | Gamers, creators |
One rule before you buy anything: a machine that is slow and more than eight years old, and still on a hard drive, is usually better replaced than upgraded. Everything else on this list is worth doing.