You’ve been working away, and then you notice your Mac is taking noticeably longer to open apps, overheating for no apparent reason, and even slowing down in Safari. Don’t rush to save up for a new one. Nine times out of 10, three things are to blame: a full disk, a resource-hungry background app, and a system that hasn’t been updated in a while. I recently freed up system data on my MacBook and was surprised by how much junk had accumulated. Below is a short monthly checklist that keeps my aging Mac running smoothly.
Sometimes MacBook lag can drive even the calmest person crazy.
My Mac is running slow: What’s the reason?
The main cause of slowdowns isn’t old hardware, but accumulated junk and background processes . When the disk is more than 85-90% full, macOS has a hard time managing files, and the system noticeably slows down. Added to this are programs running in the background and hogging the processor, plus older versions of apps that perform worse than the latest ones.
Macs slow down quite rarely, but it’s better to know in advance how to solve the problem
The good news: all of this can be fixed with macOS’s built-in tools. There’s no need to install any “optimizers” from the internet—they often do more harm than good. Want more useful Mac tips? Subscribe to our Telegram and MAX channels .
What to do if your MacBook freezes and takes a long time to open apps
The easiest and most underrated way to bring your Mac back to life is a simple reboot. When you reboot, the system flushes temporary files, clears RAM , and terminates frozen background processes that may have been piling up for days. Many people leave their Mac in sleep mode for weeks, and during this time, all sorts of junk accumulates in the memory.
Recently, a reboot really helped me.
Click the Apple logo in the upper left corner and select “Restart.” If your Mac is so slow that the cursor barely moves, hold down the power button for 10 seconds to force a shutdown , then turn it on again. By the way, many people are confused about whether it’s better to restart your Mac or turn it off and on again . There is a difference, and it affects the results.
I recently updated my MacBook Air M2 to macOS 26.5 , and the system started to lag noticeably. I rebooted a couple of times, and everything worked as expected. So before messing around with settings, just reboot your Mac.
Check your Mac storage and remove unnecessary files
macOS has a built-in storage optimizer that automatically shows you what’s taking up space and suggests what to do with it. This eliminates the need to manually navigate through folders.
To open it, do the following:
Keep at least 10% of your drive’s stated capacity free and you won’t have any problems.
- Click the Apple logo in the upper left corner and select System Preferences.
- Go to General, then Storage.
- Hover your cursor over the colored bar at the top—it will show you what exactly is taking up space: apps, documents, system data, photos.
- In the “Recommendations” block, include the appropriate items one by one.
Among them, almost every Mac typically includes “Save to iCloud,” which moves old files to the cloud, leaving only previews on the Mac. And “Optimize Storage,” which automatically deletes already-watched movies from Apple TV and attachments from email. Both options run silently in the background.
The caveat with iCloud is obvious: the free 5GB is barely enough, and if you use it heavily, you’ll have to upgrade to the paid iCloud+ plan. If you don’t want to use the cloud, you can clear it manually using the same “Storage” section: it immediately shows your heaviest apps and old downloads .
Mac System Monitor: How to Find Out What’s Using Your CPU
One misbehaving app can slow down your entire Mac. Activity Monitor shows you in real time what’s hogging your CPU, memory, and battery. To open it, go to Finder, then “Applications,” then “Utilities,” and launch Activity Monitor. Then, work through the tabs:
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- CPU tab – sort by the “% CPU” column. Anything consistently above 80-100% is suspicious.
Check this section periodically to see which app is using up resources.
- The “Memory” tab displays a “Memory Usage” graph at the bottom. If it’s green, everything is fine. If it’s yellow or red, there’s not enough RAM, and your Mac is starting to slow down.
- The Energy tab shows you which apps are draining your battery the most and causing your device to heat up the most.
Found the culprit? Select it from the list and click the cross in the top bar to force the process to close.
If you find a consumer, simply select it and close it if necessary.
Typical suspects include browsers with dozens of open tabs , instant messaging apps, and cloud storage clients. Having trouble figuring out System Monitor or have questions? Contact us in our Telegram or MAX chat , and we’re sure to help.
How to check for macOS updates if your Mac is slowing down
Outdated software almost always runs slower than newer versions. Updates often contain performance optimizations and bug fixes , including for older Mac models.
Try to update to the latest macOS
You can check for system updates by going to “System Settings,” “General,” and then “Software Update.” If there’s an update, install it—major updates take a long time to install, so it’s best to run them in the evening. Just in case, make a backup before updating.
Well, you can even install app updates automatically.
Next, update your apps: open the App Store and go to the “Updates” section in the sidebar. Install all available updates, even for apps you rarely use—they may be running in the background and draining resources.
To avoid having to do this every month, enable automatic updates : in the same Software Update section, click the button with the letter “i” next to Automatic Updates and enable all the options.
Why is my MacBook slow even after cleaning and updating?
There’s a fair line beyond which everyday methods stop working. Key signs:
- Macs don’t physically support the latest macOS , meaning new versions of apps and Safari will also gradually become unavailable.
- The brakes remain even on a clean disc and without background programs.
- The SSD is almost full, and there is nothing left to delete.
- The computer gets hot and the fan makes noise even without much load.
In these cases, monthly maintenance only prolongs the agony. But if your Mac has simply become sluggish over the past six months, the four steps above will almost always restore it to adequate speed —without reinstallation, service, or expense.
This checklist will be useful for those with a Mac over two years old, especially the base model with a 256GB drive and 8GB of RAM —these are the machines that tend to suffer from slowdowns the earliest. Newer MacBooks with the M3 and M4 models don’t yet need monthly cleaning: they have such a performance headroom that even a few heavy tabs and junk files won’t make a difference. But if your Mac has started to perform in ways it didn’t before, start with these four steps—before you start looking at the price tags of new models.
