How to speed up a slow Mac: 12 fixes that actually work (macOS Tahoe, 2026)

A slow Mac is almost always a software problem you can fix for free. Beachballs, slow app launches, and a sluggish Safari usually trace back to a full disk, too many background apps, or a fresh macOS update that is still settling in - not to hardware you need to replace. This guide walks through 12 fixes in the order a technician would actually try them, starting with the ones that take five minutes.

Everything here was tested on macOS Tahoe 26, and every step is split for Apple Silicon and Intel where the two differ - some long-repeated advice, like resetting PRAM or adding RAM, has no effect on an M-series Mac. Work down the list only as far as you need to.

Quick wins: speed up your Mac in 5 minutes

If your Mac just started dragging, these free actions give an instant result before you dig into deeper fixes.

Run this checklist top to bottom. Each item takes under a minute.

1. Quit resource-heavy apps from the Dock. Right-click the app icon in the Dock and choose Quit. This is the fastest way to close apps you can see.
2. Find the top CPU hog in Activity Monitor. Open Spotlight with Command+Space, type Activity Monitor, and press Return. Open the CPU tab, click the % CPU column to sort, select the top process, then click the [x] button at the top and choose Quit. Use Force Quit only if the app won’t respond.
3. Close spare browser tabs. Each Chrome tab runs as its own process, so a wall of open tabs adds up fast.
4. Empty the Trash. In Finder, choose Finder → Empty Trash.
5. Relaunch Finder if icons or windows are stuck. Hold Option, right-click the Finder icon in the Dock, and choose Relaunch. This resets only the Finder process; it does not restart macOS.
6. Restart the Mac if you haven’t in over a week. A fresh start clears stale processes and memory.

Step 2 does the most work: Activity Monitor shows you which process is eating the processor, so you close the real culprit instead of guessing.

One more Terminal trick

sudo purge

Which fix does your Mac need?

Use this map to jump to the right fix. Green is safe for everyone, yellow needs a little care, and red is advanced or applies only to Intel Macs.

Find what’s slowing your Mac down with Activity Monitor

/Applications/Utilities/Activity Monitor.app

Walk through the tabs one at a time. Each one points at a different resource: CPU, memory, energy, and disk.

CPU tab

The CPU tab shows which processes are working the hardest right now. Click the % CPU column to sort by it, descending. The top row is your biggest consumer.

Memory tab

The Memory tab is where slowdowns usually show up. Watch the Memory Pressure graph at the bottom:

• Green - you have enough memory
• Yellow - macOS has started swapping
• Red - memory is critical, and slowdowns are guaranteed

Also watch the Swap Used value. If it is regularly above ~1 GB, you are short on RAM.

Here is what happens under the hood. macOS first compresses idle memory pages instead of writing them to disk, which is fast. Only when that compressed memory is exhausted does macOS swap pages out to the SSD. Howard Oakley explains that macOS writes swap to disk and that heavy swap use slows the Mac. Swap on an SSD is faster than swap on an old HDD, but it is still far slower than RAM, and constant swapping wears the SSD.

Energy tab

The Energy tab helps you find apps that quietly cost you. Check the Avg Energy Impact column, which reflects the last 12 hours. A high value there exposes background apps that load the CPU and drain the battery. This one is especially useful on laptops.

Disk tab

The Disk tab shows which processes read and write the most data. High Data read/written from mds_stores or mdworker means Spotlight is indexing. Wait it out, and do not kill it. Indexing finishes on its own and then disk activity drops.

Free up storage and give macOS room to breathe

macOS uses free SSD space as virtual memory, or swap. When your drive fills up, the system loses the scratch space it needs to keep apps responsive.

When the disk climbs past about 90% full, macOS has nowhere to write swap, and apps start to freeze. The fix is to keep a healthy buffer. Aim for at least 10-15% of the disk free, and closer to 15-20% right after a macOS Tahoe update, when the system needs extra room to settle. Apple recommends freeing space when your startup disk is almost full, and Intego backs the 10-15% free-space rule.

See what’s eating your disk

Start with Apple’s built-in analyzer. Open Apple menu → System Settings → General → Storage. It breaks your usage into categories like Apps, Documents, iCloud Drive, and System Data. It’s free and built into macOS 13 and later. On macOS 12 and earlier, the path was System Preferences → Storage.

df -h /

Reclaim space

Once you know what’s taking up room, here are three reliable ways to get some back.

• Turn on Apple’s Optimize Storage. Go to System Settings → General → Storage → Store in iCloud. This offloads rarely used files to iCloud and leaves lightweight placeholders on disk.
• Empty the Downloads folder. It quietly piles up gigabytes of .dmg, .pkg, and archive files you already installed and forgot.
• Find large files without extra software. In Finder, go to File → New Smart Folder, click "+", then set File Size → is greater than → 500 MB.

Expected result: frees ~5-30 GB, depending on how cluttered your drive is.

/System/

/Library/System/

/usr/

/private/var/folders/

Cut startup and login items

Fewer things launching at login means more free CPU and RAM from the first second. Trim this list and your Mac feels quicker before you even open an app.

In macOS 13 and later, including Tahoe 26, login items live in System Settings → General → Login Items & Extensions. They split into two lists:

Here is what each list controls:

• Open at Login - apps you (or an app) added to launch at startup.
• App Background Activity - background helper agents (LaunchAgents) like Dropbox or iStat Menus helpers. These load RAM and CPU and are the ones most people never check.

Toggle off anything you do not need running from the moment you log in. Turning off a background item can break part of that app, so disable carefully and re-enable if something stops working.

On macOS 12 and earlier the path was System Settings → Users & Groups → Login Items (called System Preferences on those versions).

Advanced: check launch agents in Terminal

launchctl list | grep -v com.apple

launchctl unload ~/Library/LaunchAgents/com.example.plist

~/Library/LaunchAgents/

/Library/LaunchDaemons/

Clear caches and system junk

Caches make apps feel fast. They store data an app would otherwise rebuild every launch. The trouble starts when a cache grows stale or corrupt, and a snappy app turns sluggish.

Clear them safely. Delete the contents of a cache folder, not the folder itself. An app expects its cache folder to exist, and deleting the folder can stop the app from launching.

Know where cache lives and how safe each is

macOS keeps caches in a few places. Each one carries a different risk, so treat them differently:

• ~/Library/Caches/

  Copy

  - your user caches. Safe to empty the contents.

• /Library/Caches/

  Copy

  - system-wide caches. Clear with care, and leave the

  com.apple.*

  Copy

  folders alone.

• /System/Library/Caches/

  Copy

  - protected by SIP. You can’t delete these, and you don’t need to.

• /private/var/folders/

  Copy

  - temporary files macOS clears on its own at restart.

~/Library/Caches/

~/Library/Caches/com.apple.Safari/

~/Library/Caches/com.spotify.client/

~/Library/Caches/com.apple.dt.Xcode/

~/Library/Caches/CloudKit/

Flush the DNS cache

When a browser loads the wrong page or can’t reach a site, a stale DNS cache is often the cause. Flush it from Terminal with one command:

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

You’ll be asked for your admin password. Nothing prints on success, and your browser resolves site addresses fresh from that point on.

Rebuild font caches

atsutil databases -remove font-cache

Uninstall unused apps completely

Dragging an app to the Trash removes the app, but its support files stay behind. Caches, preferences, and launch agents keep taking space, and some still auto-launch in the background. A complete uninstall reclaims that space and stops the background activity.

Leftovers usually sit in a handful of predictable spots:

• Application support

  ~/Library/Application Support/

  Copy

• Preferences

  ~/Library/Preferences/com.developer.appname.plist

  Copy

• Logs

  ~/Library/Logs/[AppName]/

  Copy

• Caches

  ~/Library/Caches/com.developer.appname/

  Copy

• Containers

  ~/Library/Containers/[AppName]/

  Copy

  (sandboxed apps)

• Group containers

  ~/Library/Group Containers/

  Copy

  (shared containers)

~/Library/Containers/

~/Library

find ~/Library -name "*AppName*" 2>/dev/null

Remove App Store apps

For apps you installed from the App Store, the account view is cleaner than the Finder. Open App Store → your name (bottom-left) → find the app → ⋯ → Delete App.

Dragging an App Store app to the Trash from Finder does not prompt to remove app data, so it leaves leftovers behind. That gap is a common misconception. In macOS 26, moving an App Store app to the Trash does now show a data-removal dialog.

Remove non-sandboxed apps

~/Library

Tame your browser, RAM, and memory pressure

The browser is usually the heaviest app on a Mac, and it drives memory pressure more than anything else. Chrome uses a multi-process design: every tab runs as its own process. Open 20 tabs and you get 20 or more Google Chrome Helper processes in Activity Monitor. Safari and Firefox are more economical with memory.

Pick a lighter browser and rein in Chrome

Here are the practical moves that cut browser memory use the most:

• Prefer Safari on macOS. It suspends inactive tabs automatically, so a suspended tab just shows a reload indicator when you return, which is normal. That makes it the most memory-friendly browser here.
• Stop Chrome running in the background. Go to Chrome → Settings → System → "Continue running background apps when Google Chrome is closed" and switch it Off (the page lives at

  chrome://settings/system)

  Copy

  .
• Watch memory per tab in Chrome. Press Shift+Esc to open Chrome’s built-in Task Manager and see how much memory each tab uses.
• Try Firefox. Firefox 120 and later isolates sites with Project Fission and uses less memory than Chrome.

After you flip the background toggle off, Chrome stops spawning helper processes once you quit the window, so it frees memory instead of idling in the background.

Read memory pressure the right way

Now tie browser habits back to memory. Open Activity Monitor, click the Memory tab, and watch the Memory Pressure graph at the bottom. Green means you have headroom, yellow means memory is getting tight, and red means the system is struggling.

Also check Swap Used in the same tab. If it stays above ~2 GB, your Mac is memory-bound and leaning on the disk to fake extra RAM.

Inspect memory from the Terminal (advanced)

vm_stat

vm_stat 5

One line often causes confusion. Pages wired down are reserved by the system and can’t be freed without a restart, which is normal.

Reduce visual effects on macOS Tahoe (Liquid Glass)

macOS Tahoe 26 brought Liquid Glass - a design language with heavy blur, transparency, and animation across the Dock, menu bar, windows, and notifications. It leans on WindowServer and the GPU. The load shows up most on Intel Macs and on the M1.

Turning it down is the biggest instant win on older hardware. Here is the full list for macOS Tahoe 26.

Work through these five settings in order:

1. Open System Settings → Accessibility → Display and turn Reduce Transparency on. This swaps the blur for an opaque background.
2. In the same pane, turn Reduce Motion on. This removes Mission Control, window-open, and space-switch animations.
3. Go to System Settings → Desktop & Dock and turn Animate opening applications off.
4. In the same pane, turn Automatically hide and show the Dock on. The Dock then renders less often.
5. Turn Show suggested and recent apps in Dock off.

Changes apply instantly, with no restart. Reduce Transparency kills the blur but leaves some animation in place, so turn on both Reduce Transparency and Reduce Motion for the full effect.

Expected result: smoother window and Mission Control animations right away, and lower GPU load on older hardware.

Terminal shortcut

If you prefer the command line, you can flip the same switches from Terminal.

defaults write com.apple.universalaccess reduceTransparency -bool YES

killall SystemUIServer

killall SystemUIServer

killall Dock

For motion, run

defaults write com.apple.universalaccess reduceMotion -bool YES && killall Dock

Fix slowdowns right after a macOS Tahoe update

Right after a macOS update, a slow Mac is usually temporary. Background maintenance is running behind the scenes. Give it time before you "fix" anything.

Spotlight is reindexing

mds_stores

mdworker_shared

mds

mds_stores

sudo mdutil -s /

It reports the index as enabled, indexing, or disabled.

sudo mdutil -E /

There is also a UI alternative. Open System Settings → Spotlight → Search Privacy, add your startup volume to the list, wait a moment, then remove it to trigger a reindex.

Adding the volume tells Spotlight to stop indexing it, and removing it starts a fresh index from scratch.

Other post-update background work

Spotlight is not the only task running after an update. Here is what else commonly keeps your Mac busy:

• PhotoAnalysisService scans your library for faces, scenes, and text. It can use CPU for hours after the first launch of Photos on a new version. This is normal - just wait. You can ease it in Photos → Settings if needed.
• dyld shared cache rebuild (

  update_dyld_shared_cache

  Copy

  ) recompiles system libraries. It takes 5-15 minutes, and the Mac speeds up noticeably once it finishes.
• iCloud Drive re-syncs after an update, which shows up as

  nsurlsessiond

  Copy

  .

As a rule of thumb, give a Mac 24-48 hours after a major update before you apply quick fixes. Most slowdowns clear on their own.

Point releases (macOS 26.x) are lighter - usually just 10-30 minutes of reindexing. If it drags on for more than a day, diagnose it in Activity Monitor. Also install the latest 26.x point release, since Apple fixes known performance regressions there.

Expected result: most post-update slowdowns resolve within 24-48 hours with no action needed.

Scan for malware and adware

Adware and malware are a real, if less common, cause of a slow Mac. A hijacked browser or a hidden background process can eat CPU and memory all day. Here is how to spot the signs and check the safe way.

Know the signs

Watch for these symptoms. One alone may be harmless; several together point to an infection.

• Browser redirects send you to pages you didn’t ask for.
• Surprise ads appear on sites that never had them.
• Odd processes show up in Activity Monitor with random alphanumeric names, or names like SearchParty.
• Strange notifications arrive from apps you don’t recognize.
• Unknown startup files appear as new .plist files in

  ~/Library/LaunchAgents/

  Copy

  .

Trust the built-in defenses

macOS defends itself out of the box with three layers:

• XProtect is the built-in antivirus. It updates silently in the background.
• Gatekeeper blocks unsigned and non-notarized apps at launch.
• MRT, the Malware Removal Tool, removes known threats in the background.

In macOS 26, Gatekeeper requires notarization for apps outside the App Store. An unsigned app shows the message "Apple cannot check it for malicious software" when you try to open it.

Do a quick manual check

You can look for suspicious startup items yourself in about a minute.

1. In Finder, open Go → Go to Folder, type

   ~/Library/LaunchAgents/

   Copy

   , and press Return.
2. Scan the .plist filenames. Legitimate ones usually name a real app or vendor; random strings are a red flag.
3. To check your antivirus version, open System Settings → General → Software Update, then click the (i) next to Automatic Updates to see the XProtect version.

kernel_task

mds

launchd

WindowServer

logd

configd

opendirectoryd

Run a deeper scan

If the signs point to adware but you can’t find the source, a dedicated scanner helps. Two free, well-regarded options:

• Malwarebytes for Mac runs a free scan and removes common adware.
• KnockKnock shows every item set to run automatically, so you can spot what doesn’t belong.

Hardware-level fixes: resets, diagnostics, thermal, and battery

If software fixes don’t help, look at the hardware layer. Several classic "resets" are Intel-only. They are labeled below so Apple Silicon owners don’t chase steps that do nothing on their Mac.

NVRAM reset — Intel only

NVRAM stores small settings like startup disk, screen resolution, and sound volume. Reset it only for specific symptoms: a wrong clock, the wrong startup volume, or a wrong screen resolution.

On an Intel Mac: Shut down. Turn it on and immediately hold Option+Command+P+R for about 20 seconds, then release.

On Apple Silicon: There is no key-combo NVRAM reset. Apple confirms that Apple Silicon Macs manage NVRAM automatically and reset it when needed, so the old Option+Command+P+R does nothing.

SMC reset — Intel only

On Apple Silicon, the SMC is built into the M-series chip, so there is nothing to reset. This step applies to Intel Macs only.

The steps differ by Mac type:

1. Intel MacBook: Shut down. Hold Shift+Control+Option on the left side plus the Power button for 10 seconds, then release all keys and turn it on.
2. Intel desktop (Mac mini, iMac, Mac Pro): Shut down. Unplug the power cord for 15 seconds, plug it back in, then turn it on.

Apple documents the exact key combinations for each model.

Test the hardware with Apple Diagnostics

Apple Diagnostics runs a quick hardware check and reports codes for failing parts. Start it by model:

• Intel Mac: Turn it on and immediately hold D. Hold Option+D instead to run the internet version.
• Apple Silicon Mac: Hold the Power button until "Loading startup options" appears, then press Command+D.

A few codes are worth knowing:

• PPT004 - the battery needs service
• VDH002 - a storage problem
• NDN001 / ADP000 - no problem found

Apple explains the full code list and what each one means.

Thermal throttling

Heat can slow a Mac even when the CPU looks idle. If the Mac slows sharply under load while CPU usage in Activity Monitor stays around 50-70%, thermal throttling is the likely cause.

Let the Mac cool down, keep the vents clear, and don’t block airflow on a bed, couch, or lap. A hard surface and a bit of clearance keep it running at full speed.

Battery health

A worn battery can throttle a laptop. Open System Settings → Battery → Battery Health. If it reads Service Recommended, the battery has degraded, and macOS may cap peak CPU to protect it.

You can also check it in Terminal with

system_profiler SPPowerDataType | grep -i "Condition"

Normal

CPU temperature

You can read the current CPU temperature from Terminal to confirm a heat problem. The command differs by chip.

sudo powermetrics --samplers smc -n 1 | grep -i temp

sudo powermetrics --samplers cpu_power -n 1

A sustained high reading under light load confirms the Mac is running hot and likely throttling.

Manual vs. automatic: the fastest way to speed up a Mac

The fastest route depends on how comfortable you are with your Mac and how much you want to automate. Some people enjoy digging through folders. Others just want a slow Mac fixed in five minutes. Both paths work, and the table below maps each method to the effort it takes.

Here is how the main cleanup methods compare on effort, time, and payoff:

Manual methods cost time but nothing else. Automated tools cost money but save that time and reach places the built-ins skip.

Start with the free built-ins

Before you pay for anything, use the tools already on your Mac. Open System Settings → General → Storage for a guided view of what fills your disk, with buttons to review large files, old downloads, and app data. Then open Activity Monitor to see which apps eat CPU and memory right now.

These two cover most slowdowns for free. Work through them first, and only look at paid software if you still want more.

What automated tools do better

Paid cleaners earn their place on a few specific jobs that the built-ins handle poorly or not at all:

• Complete removal - they delete an app along with the support files, caches, and login items it leaves behind
• Content-based duplicate finding - they match files by what is inside them, so renamed copies still get caught
• Visual disk analysis - they map your storage as a treemap, so the biggest space hogs are obvious at a glance

Usually, they come as separate apps, so you’ll need to do your research to select the one in each category that fits you best.

Where Nektony tools fit

A Nektony app packages this work into a few clicks. MacCleaner Pro by Nektony is a bundle that covers junk cleanup, duplicate finding, disk analysis, memory freeing, and app uninstalling in one place.

For instance, the built-in app cleaner focuses on removal, tracking what each app writes to your disk so it can pull every related file when you uninstall. Nektony also offers each tool as a standalone app if you don’t need the whole bundle.

Treat those tools as smart shortcuts. The built-ins get you most of the way; these tools handle the leftovers and the tedious searches faster without compromising on accuracy.

The bottom line

Most slow Macs recover without any spending or new hardware. If you only remember one thing, work in this order:

1. Find the cause first in Activity Monitor - check the CPU, Memory, and Energy tabs before you change anything.
2. Low on space? Free the disk until you have at least 15-20 GB, more right after an update.
3. Trim what launches - turn off login items and background agents you don’t need.
4. Lighten Liquid Glass with Reduce Transparency and Reduce Motion, especially on Intel and M1 Macs.
5. Just updated? Give the Mac 24-48 hours for Spotlight and the dyld cache to finish, and install the latest macOS 26.x point release.
6. Still slow? Run Apple Diagnostics and check Battery Health for a hardware fault.

If you would rather automate the cleanup, MacCleaner Pro by Nektony bundles junk, duplicate, disk, memory, and app cleaning tools in one place.