How to Speed Up a Slow Computer Without Buying a New One

This guide is for anyone whose computer takes ages to start, freezes when several things are open, or simply feels slower than it used to. You will learn how to find the real cause of the slowdown, apply free fixes in a sensible order, decide whether a cheap upgrade is worth it, and recognise when a computer has genuinely reached the end of its useful life. The steps cover both Windows PCs and Macs.

Why Computers Slow Down

Computers rarely get slower because the hardware wears out. Much more often, they are being asked to do more than they were a few years ago. Over time you install more programs, many of which start automatically and run in the background. Web pages and apps become heavier. The storage drive fills up. Updates add features that need more memory. Each change is small, but together they can make a once-quick machine feel sluggish.

The good news is that most of these causes can be fixed for free, in an afternoon. The trick is to work out which one is affecting you, rather than trying random tips. The main suspects are:

• Too many programs running at once, especially at start-up.
• Not enough memory (RAM) for the number of browser tabs and apps you use.
• A nearly full storage drive, which leaves no room for temporary files.
• An older spinning hard drive rather than a modern solid-state drive (SSD).
• Out-of-date software or a stuck update.
• Unwanted software or malware using resources in the background.
• Overheating caused by dust, which makes the processor slow itself down.

Diagnose First: What Is Actually Slow?

Both Windows and macOS have a built-in tool that shows exactly what is using your computer's resources. Spend five minutes here before changing anything. On Windows, press Ctrl + Shift + Esc to open Task Manager and click More details if you see a small window. On a Mac, open Activity Monitor from Applications, then Utilities, or search for it with Spotlight.

Use the computer as you normally would, with your usual browser tabs and apps open, and then look at the following figures.

Also check what kind of drive you have. On Windows, open Task Manager, go to the Performance tab, and click your disk; it will say SSD or HDD. Most Macs from recent years use SSDs. This single fact often explains why an older machine feels slow, and it matters later when deciding on upgrades.