The frustrating thing about a Mac that feels slower than it used to is that nothing obvious has changed. You didn't do anything wrong. You didn't install anything suspicious. It just... drifted. A little slower every few months, until one day you notice.
This post explains why that happens, in plain English. No jargon. If you just want the quick reassurance: your Mac is almost certainly fine, and the causes are fixable. If you want to understand it a bit more before diving in, keep reading.
(If you've already read do Macs actually slow down over time, this is the follow-up: that post handles the conceptual question. This one is the diagnostic. Here's what's actually causing it and what to do.)
Is your Mac actually slower, or are the things you're doing harder?
This is worth asking honestly before anything else.
The tasks most people use their Macs for in 2026 are more demanding than they were in 2022. Video calls are sharper and more CPU-hungry. Browser tabs are heavier. Creative apps do more. Your Mac hasn't changed; the workload has quietly grown around it.
That doesn't mean the slowdown isn't real. It often is. But it's a useful framing: the question isn't just "is my Mac slower?" but "is my Mac slower relative to what I'm asking it to do?"
In many cases, both things are true at once. The Mac is doing slightly more work per app, and the software environment around it has accumulated over time. The good news is that the accumulation part is entirely fixable.
The four most common reasons it feels slower
These aren't guesses. They account for the vast majority of the "my Mac used to be faster" complaints I hear. They're listed roughly in order of how often they're the culprit.
1. Login items have accumulated. Every app you install has the option to add itself to your Mac's startup routine. Adobe updaters, Google Drive, Dropbox, Spotify, printer software, cloud backup tools: each one quietly adds itself to the list of things that launch when you turn your Mac on. After a year or two, dozens of these are running in the background, using memory and processing power, for every hour you're on your Mac. You almost certainly don't need most of them running constantly.
To see what's on your list: System Settings › General › Login Items & Extensions. You'll see "Open at Login" and "Allow in the Background". Toggle off anything you don't recognise or don't actively use. Most are safe to disable; if something stops working, you can turn it back on.
2. Your disk is getting full. Storage (the long-term place your Mac keeps files) works less efficiently when it's nearly full. When your disk exceeds about 90% full, macOS struggles to move files around and do routine maintenance, and performance visibly degrades. Think of it like a desk covered in papers: the actual desk hasn't changed, but you can't work as efficiently when there's no clear space.
Check via Apple menu › About This Mac › More Info › Storage. If you're above 85-90%, clearing space will make a noticeable difference. Old downloads, duplicate photos, and apps you haven't opened in a year are usually the quickest wins.
3. macOS has gotten heavier. Each new version of macOS adds features, and those features use more of your Mac's resources than the previous version did. Apple Intelligence, Continuity features, richer notifications, system-wide search improvements: useful things, but they ask more of the same hardware you had when you bought the Mac. A machine that ran smoothly on macOS Monterey may feel a little more loaded on macOS Sequoia.
This doesn't mean you should avoid updating (security updates matter), and Apple doesn't throttle older Macs on purpose. It's just the honest reality that software gets heavier over time.
4. Today's apps are heavier than yesterday's versions. Chrome in 2025 uses meaningfully more memory than Chrome in 2020, for the same browsing behaviour. Slack, Teams, Zoom, and most Electron-based apps (apps that are essentially a web browser wrapped in a desktop shell) grow with each release. Your Mac hasn't changed; the apps running on it have grown larger.
This one is harder to control, but there are things you can do: switch from Chrome to Safari for day-to-day browsing (Safari is noticeably lighter on Mac memory), quit apps you're not actively using rather than leaving them open, and be selective about how many browser tabs you carry around.
There's a fifth factor worth mentioning if you're on a MacBook: battery aging. As a laptop battery ages, it can't always sustain the peak power draw the chip needs for demanding tasks, so your Mac occasionally throttles its own performance to protect the battery. This is more noticeable under load than in everyday use. You can check your battery health in System Settings › Battery › Battery Health. If it reads "Service Recommended", the battery is a legitimate contributor to what you're feeling.
How to reverse it
The good news: three of the four causes above are directly fixable, without spending anything, without technical expertise, and without Terminal.
Audit your login items. This is the highest-leverage fix for most people. Go to System Settings › General › Login Items & Extensions and work through the list. Anything you don't recognise, don't use regularly, or don't need running in the background: turn it off. The effect on startup time and background memory use is often dramatic.
Free up disk space. Aim for at least 10% of your disk free, ideally 20%. The "Recommendations" section in Storage Settings will suggest things to remove. Otherwise: check your Downloads folder (most people haven't emptied it in years), look for duplicate or redundant photos, and uninstall apps you haven't opened since you installed them.
Manage memory habits. Memory (also called RAM) is the temporary workspace your Mac uses to hold what's currently running. When it's full, performance degrades. The practical fix: quit apps you're not using rather than just closing their windows. Quit Chrome, Photoshop, Slack, and Teams when you're done with them for the day. Restart your Mac once a week to clear what's accumulated. If you'd rather not do this manually, Shiny sits in your menu bar and handles the memory part in one click: it asks macOS to release inactive memory and pauses apps that have been idle for hours. $4.99 once, no subscription. (Disclosure: I make Shiny. The manual steps above are just as effective and cost nothing; Shiny is for people who'd rather not think about it.)
Switch to Safari for browsing. This is the single highest-impact app-level change most people can make. Chrome is excellent, but it uses significantly more memory on Mac than Safari for the same pages. If you keep lots of tabs open, the difference is substantial. For more on diagnosing what's using your Mac's memory, see why is my Mac so slow and how to make an older Mac fast again.
What you can't reverse, and when to consider upgrading
Software accumulation is reversible. Hardware age, mostly, isn't.
If your Mac is from 2017 or earlier, running on an Intel chip, you're reaching the natural end of its useful life. macOS updates are leaving those machines behind, and apps built for the current generation of Macs will increasingly feel sluggish on older Intel hardware. The fixes above will still help at the margins, but they won't make an ageing Intel Mac feel like a new one.
If your Mac is from 2020 or later with an Apple Silicon chip (labelled M1, M2, M3, or M4), the hardware is genuinely not the problem. These chips are dramatically more efficient than Intel, and a 2021 M1 MacBook Air still performs well today. If that machine feels slow, it's almost certainly a software accumulation issue, and the fixes above will work.
Signs you've genuinely outgrown your hardware, rather than just accumulated software:
- Memory pressure (the graph in Activity Monitor, under the Memory tab) stays red even after quitting every app and restarting.
- Apps you rely on daily are noticeably slow regardless of what else is running.
- Your Mac no longer receives macOS security updates.
Apple's own support page on what to do if your Mac runs slowly is worth reading if you're not sure. If you're still stuck after working through this post, see what to do when your Mac slows down after a macOS update.
But: try the software fixes first. For most people, slowing is accumulation, not age. And accumulation fixes are free.