May 18, 2026
Mac Running Slow? 7 Things to Check Before You Call Anyone
Your Mac is dragging? Before paying for a tune-up, run through 7 free checks an Apple tech actually uses. Plain-language fixes for Idyllwild and Hemet Macs.
You sit down with coffee, open Mail, and the rainbow wheel spins. The dock takes ten seconds to respond. The fan kicks on for no obvious reason. The Mac that used to feel snappy now feels like it's wading through mud.
Before you spend money on a tune-up or start shopping for a new machine, there are seven checks you can run yourself in twenty minutes. I do these in order on every slow Mac that lands on my bench, and the fix is usually somewhere in this list.
Why Your Mac Feels Slow When It Used to Feel Fast
A Mac doesn't usually get slow all at once. It gets slow the way a car gets dirty — a little at a time, until you notice you can't see out the windshield. Software updates ask for more memory than they did two years ago. Apps auto-launch at login. The drive fills up. A browser tab leaks memory in the background. None of those alone would slow you down. Together they can make a healthy Mac feel broken.
Most of those problems are reversible without paying anyone. And if these seven checks don't fix it, you've narrowed the problem to something a tech can actually solve, instead of paying for a vague tune-up.
The First Three Checks (Free and Fast)
These three account for the majority of slow Macs I see in Idyllwild, Hemet, and down the hill into Riverside County. Do them in order.
Check 1 — A real shut down, then a fresh start. Most people close the lid and call it done. The Mac never actually powers off, and weeks of small memory leaks pile up. Click the Apple menu, choose Shut Down, wait for the screen to go fully black, count to ten, then press the power button. If your Mac feels faster for the rest of the day, you've just learned something. I tell clients to do this once a week on purpose.
Check 2 — Free up storage. macOS gets noticeably sluggish when the startup disk is more than about 85 percent full, because it can't shuffle temporary files efficiently. Open the Apple menu → System Settings → General → Storage. Look at the colored bar. If it's nearly full, the biggest wins are usually in Documents (old downloads), Mail (years of attachments), and the iOS device backups people forget about. Apple has a clean walkthrough of the built-in storage tools here: Apple — Free up storage space on your Mac . Aim to keep at least 15 to 20 percent of the drive free.
Check 3 — Look at Activity Monitor. Open Spotlight, type "Activity Monitor," hit return. Click the CPU column to sort by usage. If a single process is sitting at 80 to 200 percent CPU for minutes at a time, that's your slowdown. The usual suspects: a stuck browser tab, an old print driver, Photos rebuilding its library, or a sync service that's stuck in a loop. Quit the offender, see if the Mac wakes back up. Then click the Memory tab and look at Memory Pressure at the bottom — if that graph is red, your Mac is swapping to disk and nothing on it will feel quick until you close some things.
Three More Checks That Catch the Stubborn Slowdowns
If the first three didn't do it, these are where the long-running problems hide.
Check 4 — Login items and background apps. Over a few years, software you barely remember installing has quietly added itself to launch at startup. System Settings → General → Login Items & Extensions. Look at both lists — "Open at Login" and "Allow in the Background." Turn off anything you don't recognize or don't use every day. Updaters, cloud-storage clients you abandoned, printer assistants, screen-recording helpers — they all want CPU and memory the moment you log in.
Check 5 — Browser tabs and extensions. Safari and Chrome are quietly the heaviest apps on most Macs. Twenty open tabs plus a handful of extensions can eat more RAM than the rest of the system combined. Close tabs you're not actively using (bookmark them if you're afraid to lose them). In your browser's settings, disable any extension you didn't install yourself on purpose. If your Mac feels dramatically faster the moment you quit your browser, you've found the culprit.
Check 6 — macOS updates and Spotlight indexing. Two things can secretly hammer a Mac in the background. The first is a pending macOS update — System Settings → General → Software Update. If it's been waiting, install it during a meal so you don't fight it for resources. The second is Spotlight rebuilding its search index, which happens after big updates, big file moves, or a new drive. Open Activity Monitor and look for a process called mds or mdworker near the top. If it's pegged, leave the Mac plugged in and awake for an hour or two and let it finish. The slowdown ends when the indexing does.
Check 7 — When It's Actually the Hardware
If you've done all six and your Mac is still slow, the seventh check is hardware. The usual answer on an Intel Mac older than about 2018 is one of three things: the drive is failing, the RAM is the original (and undersized for modern macOS), or the thermal paste inside has dried out and the CPU is throttling itself to avoid overheating.
You can sanity-check the drive yourself by opening Disk Utility, selecting your internal drive on the left, and clicking First Aid. If it reports errors, back up immediately. For Apple Silicon Macs (M1, M2, M3, M4), the drive and RAM are soldered to the logic board, so the hardware causes shift — most slowdowns on those machines really are software, which is why the first six checks matter even more.
In my 22 years fixing Macs across Idyllwild, Hemet, San Diego, and Riverside County, the pattern is the same: software causes the slowdowns people complain about, hardware causes the ones that don't go away. I've been hands-on with every flavor of Mac since the PowerPC days, picked up the Outskill AI Generalist (AIG) Fellow credential in November 2025, and serve as a Lieutenant and Division Officer in the U.S. Naval Sea Cadets. The habit I teach the cadets is the one I'm teaching you here — work the cheap checks first.
When to Stop Tinkering and Call Someone
There's a point where doing more yourself costs more than it saves. If you've worked through the seven checks and the Mac is still slow, or Disk Utility flagged drive errors, or the fan never stops, stop. Back up to an external drive or iCloud first — that's the one step worth doing before anything else — then get a real diagnosis instead of guessing.
If you're local to Idyllwild or anywhere across Riverside County, I do on-site and remote Mac work. Most slow-Mac calls take under an hour and I'll tell you on the call whether it's worth fixing or whether you're better off replacing. Reach me through the contact page or by phone at (951) 468-5674. Seniors get a discount.
FAQ
How often should I restart my Mac?
Once a week is the habit I recommend, and any time the machine starts feeling sluggish for no obvious reason. Closing the lid puts the Mac to sleep — it doesn't reset memory or clear out the small leaks that build up over days of use. A full shut down, ten-second pause, and power-up takes under a minute and fixes a surprising number of complaints.
Will more RAM make my old Mac faster?
Sometimes, but check first. Open Activity Monitor, click the Memory tab, and watch the Memory Pressure graph while you work normally. If it stays green, more RAM won't help noticeably. If it spends time in yellow or red, more RAM will help — but only on Intel Macs where RAM is upgradeable. On any Apple Silicon Mac, the RAM is part of the chip, so the only way to add memory is to buy a new machine.
Do Mac "cleaner" apps actually speed things up?
Mostly no, and several of them make things worse. The reputable ones do what you can already do for free in System Settings and Activity Monitor. The shady ones install background processes of their own — which means the app you bought to speed up your Mac is now one of the things slowing it down. The only third-party utilities I trust are well-known names with paid support, not the pop-up "your Mac is infected" downloads.
My Mac is from 2015. Is it worth fixing or should I just buy a new one?
Honest answer: it depends on the model and what you do with it. A 2015 MacBook Air used for email, web, and writing can often be brought back to usable with an SSD check, a RAM upgrade if it has slots, and a clean macOS install. A 2015 MacBook Pro used for video work probably isn't worth the parts. I give people an honest yes/no on this in the first ten minutes of a call, and I'd rather lose the repair than sell you a fix that won't last another year.