1. Your storage is almost full

macOS uses a portion of your SSD as virtual memory — a temporary workspace when RAM runs out. When your drive is more than 90% full, this virtual memory has nowhere to go and the system starts crawling. Applications take longer to launch, file operations slow down, and the spinning beachball appears constantly.

Check: Apple menu → About This Mac → Storage. If you're at 90% or above, that's your culprit. Click Manage to see what's using space — often it's large video files, old iOS backups, or a Downloads folder that's never been emptied.

If your MacBook has a non-upgradeable SSD and you're constantly bumping up against the storage limit, an external SSD is a cheap fix for media storage. Or bring it to us — some older MacBook models (pre-2016) have SSDs that can be upgraded.

2. Too many login items and background processes

Every app you install wants to start itself at login. Over time, this accumulates into a dozen or more apps all launching simultaneously when you start your MacBook, competing for CPU and RAM before you've even opened anything intentionally.

How to check and fix:

  1. 1Apple menu → System Settings → General → Login Items & Extensions
  2. 2Review everything in "Open at Login" — remove anything you don't need starting automatically
  3. 3Also check "Allow in Background" — some apps run silently even when you haven't opened them
  4. 4Restart and notice the difference

3. The thermal paste has dried out

This one surprises people. MacBooks older than 4–5 years often have dried, cracked thermal paste between the CPU and its heatsink. Thermal paste is the compound that transfers heat from the processor to the cooling system. When it fails, the CPU runs hotter, triggers thermal throttling (the system deliberately slows the processor to prevent damage), and your MacBook becomes noticeably sluggish under any load.

Symptoms: the fans run loudly even during light tasks, the bottom of the MacBook gets hot quickly, and performance is fine for a few minutes then degrades. If this sounds familiar, a repaste is a relatively inexpensive fix that can make a 5-year-old MacBook feel significantly faster.

4. You don't have enough RAM for what you're doing

8GB of RAM was adequate for macOS when many older MacBooks shipped with it. It's genuinely tight now, especially with modern browsers. Chrome and Safari are particularly heavy — each tab is a separate process and can use 200–500MB of RAM by itself. If you regularly have 10+ tabs open plus a few applications, 8GB will be constantly swapping data to disk, which is slow.

Check: open Activity Monitor (search in Spotlight), click the Memory tab, and look at the Memory Pressure graph at the bottom. If it's regularly yellow or red, you're RAM-constrained. On Intel MacBooks with upgradeable RAM, this is fixable. On M-series Macs, RAM is soldered — but M-series Macs handle memory pressure much better than Intel ones did.

5. Your SSD is failing

SSDs don't last forever. They have a finite number of write cycles, and as they approach end-of-life they start performing badly — slow writes, read errors, and overall sluggishness that looks a lot like a RAM or CPU problem. This is more common on MacBooks from 2013–2017 that had smaller SSDs (128GB or 256GB) that have been heavily used.

A failing SSD is a data emergency waiting to happen. If your MacBook is slow AND you're seeing occasional kernel panics, apps unexpectedly quitting, or files that won't open — back up everything immediately and bring it in.

6. macOS needs a clean slate

Sometimes the issue is software — corrupted system files, a problematic system extension, or accumulated cruft from years of updates. A clean install of macOS can restore a sluggish MacBook to near-new performance without any hardware changes. It's a more drastic step, but worth considering if the hardware checks out fine.

Quick things to try right now

Free fixes worth trying before booking anything:

  • Restart — a MacBook that's been in sleep mode for weeks accumulates memory fragmentation
  • Clear your browser cache — especially if Safari or Chrome is slow specifically
  • Empty your Downloads folder and Trash
  • Open Activity Monitor and sort by CPU — look for anything using 50%+ when idle
  • Update macOS — sometimes slowdowns are software bugs that Apple patches
  • Reset SMC and PRAM/NVRAM (Google the steps for your specific model)

When to bring it in

If you've worked through the free fixes and it's still slow, or if you're seeing symptoms that suggest hardware (high temperatures, fans at full speed, kernel panics), bring it in for a diagnostic. We'll tell you exactly what's causing the slowdown and what it would cost to fix — and we'll be straight with you if we think the machine isn't worth repairing.

A slow MacBook isn't necessarily a dead MacBook.