Mac running slow? Here's what actually helps (and what doesn't)

"My Mac used to be so fast." I hear it almost every week. The good news is that a slow Mac is rarely a dead Mac. In most cases the machine is fine — it's just clogged, out of space, or running too much in the background. Before you spend a small fortune on a new one, work through the fixes below.

First, the things that genuinely make a difference

1. Free up storage space

This is the big one. macOS slows dramatically when the startup disk gets close to full, because it needs free space to work. If you're down to your last few gigabytes, clearing space alone can transform performance. Empty the Trash, remove large old files, and move photos and videos you rarely touch to an external drive or iCloud.

2. Check what launches at startup

Over the years, apps quietly add themselves to your login items and run in the background from the moment you switch on. Many you'll never use. Trimming these back means your Mac wakes up ready to work instead of busy loading things you don't need.

3. Quit the apps quietly eating memory

A handful of apps — certain browsers with dozens of tabs, photo libraries, and some "cleaner" tools — can use far more memory than you'd expect. Closing what you're not using, and keeping browser tabs under control, often fixes the spinning beachball on the spot.

4. Install updates (but at the right time)

Keeping macOS and your apps updated fixes bugs and security holes. That said, on much older Macs the very newest macOS can sometimes feel heavier than the version it shipped with — so it's worth getting advice before a major upgrade rather than after.

5. Restart properly

Many people never actually shut down — they just close the lid. A full restart once in a while clears temporary clutter and resolves a surprising number of slowdowns. It's the simplest fix on this list, and it's free.

The upgrade that brings older Macs back to life

If your Mac is more than a few years old and still has a traditional spinning hard drive, fitting an SSD is the single biggest improvement you can make. Startup that took two minutes can drop to seconds. On Macs that allow it, adding memory helps too. These upgrades cost a fraction of a new machine and often buy several more good years.

Rule of thumb: if the Mac is structurally fine and you just want it faster, upgrade. If the screen, keyboard and battery are all failing at once on an old model, replacing may be the smarter spend. I'll tell you honestly which side of that line you're on.

What usually doesn't help

Be wary of the "speed up your Mac" apps that pop up online. Many do little beyond what macOS already does, some bombard you with upgrade prompts, and a few cause more problems than they solve. You rarely need third-party cleaners — and you should never install one that appears in a scary pop-up warning you your Mac is "infected."

Still slow after all that?

If you've freed up space, trimmed startup items and restarted, and it's still crawling, there may be a deeper cause — a failing drive, a background process gone wrong, or a hardware fault. That's worth a proper look rather than more guesswork.

I work on Macs, MacBooks, iMacs, iPhones and iPads every week, and I can connect remotely from anywhere in the world or visit in person across the Costa Blanca. Tell me what yours is doing and I'll point you to the quickest, most cost-effective fix.