How to Speed Up Your Mac in 2026: A Step-by-Step Guide

There’s an old joke that the best way to speed up any computer is to throw it off a roof and buy a new one. For Macs in 2026, that’s overkill at least 80% of the time. Most slowdowns are software-side, which means most of them are reversible — without spending a cent.

This guide walks through the steps in the order I’d actually do them on someone’s Mac, not in alphabetical order or by topic. Start at the top, work down, and stop when things feel right again.

Step 1: Restart. Yes, really.

If your Mac has been running for more than a week, restart it before doing anything else. Memory leaks build up over time in WindowServer, kernel_task, and various background daemons. A reboot clears them out completely.

Quick test: Apple menu → About This Mac → More Info → System Report → Software. Look at “Time since boot.” If it’s over 14 days, restart and see how much of your problem just disappears.

Step 2: Check what’s actually running

Open Activity Monitor (Spotlight: type “Activity Monitor”). The CPU tab and Memory tab tell different stories — both matter.

Sort CPU by % CPU, descending. Anything sitting at 50%+ for more than a minute is suspicious. Common culprits:

• WindowServer — usually fine, but if it’s pegged, restart
• kernel_task — when this runs hot, it usually means thermal throttling
• mds_stores / mdworker — Spotlight indexing
• photoanalysisd — Photos library scanning faces and scenes
• Google Chrome Helper (Renderer) — usually one specific tab

For memory, sort by Memory descending. Anything using more than 4GB that you’re not actively using is fair game to quit.

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Step 3: Free up disk space

macOS needs free space to function — for swap memory, virtual memory, snapshots, and caches that the OS itself uses. Below 15% free, performance starts to degrade. Below 10%, it’s painful.

Go to Apple menu → System Settings → General → Storage. Click each category to see what’s taking space.

The big wins, roughly in order:

1. Downloads folder — almost always 5-30GB of stuff you don’t need
2. Old iOS backups — ~/Library/Application Support/MobileSync/Backup/ — can be 50GB+
3. Mail attachments — Mail caches every attachment locally; in ~/Library/Mail
4. Xcode caches — if you’re a developer, ~/Library/Developer/Xcode/DerivedData can be 100GB+
5. App caches — across all apps in ~/Library/Caches
6. Old Time Machine local snapshots — usually auto-cleared, but worth checking

Step 4: Trim your login items

Every app that auto-starts adds boot time and steals RAM forever after. Go to System Settings → General → Login Items & Extensions.

Two sections matter:

• Open at Login — apps that launch when you log in
• Allow in Background — apps that keep agents running even when “closed”

Be ruthless. Spotify, Microsoft AutoUpdate, Adobe Creative Cloud, Dropbox, OneDrive, Zoom, Adobe Acrobat — all of these usually don’t need to start at login. You can launch them when you actually need them.

Step 5: Clear app caches

Caches are supposed to make apps faster but in practice they grow unbounded. The big offenders by 2026:

• Safari — ~/Library/Caches/com.apple.Safari can hit 8GB
• Chrome — ~/Library/Caches/Google/Chrome similar size, sometimes more
• Slack — saves every image and video you’ve ever seen
• Spotify — caches every track you’ve recently played
• Discord — stores every image, GIF, and clip locally
• Adobe apps — cache giant amounts of preview data

You can clear them manually by quitting the app, navigating to the folder in Finder, and dragging contents to Trash. The risk is messing up an app that’s still running, or accidentally deleting something the app actually needs.

Step 6: Disable visual effects on older Macs

If you’re on anything pre-M1 — a 2019 MacBook Pro, an Intel iMac, a 2017 MacBook Air — turn off visual effects.

System Settings → Accessibility → Display → Reduce Motion and Reduce Transparency. Both make a real, perceptible difference on older hardware. On M1+ machines, the difference is barely measurable.

Step 7: Check for runaway browser tabs

Open your browser and look at how many tabs are open. If it’s more than 30, that’s almost certainly a slowdown source. Each tab — especially apps like Notion, Figma, Gmail, Slack — pins memory.

In Chrome, go to chrome://memory-redirect/ (or use the built-in Task Manager: Window → Task Manager or Shift+Esc) to see per-tab memory. Close anything over 500MB you’re not actively using.

In Safari, open Window → Activity and Window → Pinned Tab to find heavy pages.

Step 8: Update macOS — but check first

Sometimes updates fix performance bugs (Sonoma 14.4 fixed a kernel_task issue that was killing 2018 Intel MacBook Pros). Sometimes they introduce them.

Before updating, check forums and Apple Community for the specific update version. If reports look good, update. If not, wait a week. The point release usually fixes whatever the dot-zero broke.

Step 9: Repair the disk

Run Disk Utility (Applications → Utilities → Disk Utility), select your startup disk, click First Aid. This catches filesystem inconsistencies that can cause slowdowns and weird app behavior. It’s safe — it doesn’t delete anything.

Step 10: Free inactive memory

macOS aggressively caches in RAM, which is fine until it isn’t. The Memory Pressure graph in Activity Monitor (Memory tab, bottom) tells you the truth — green is healthy, yellow is concerning, red means you’re swapping to disk.

There’s a Terminal command — sudo purge — that frees inactive memory. Use it sparingly, and only if memory pressure is yellow/red.

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Step 11: Audit privacy permissions

Not strictly performance, but worth doing while you’re auditing your Mac. System Settings → Privacy & Security. Apps that have camera, microphone, full disk access, or screen recording permission they don’t need can slow things down by running background scans.

Revoke anything weird. If an app needs the permission back, it’ll ask.

Step 12: Reset SMC and NVRAM (Intel only)

This doesn’t apply to Apple Silicon. On Intel Macs, SMC and NVRAM resets fix a surprising number of weird issues — fan speed, sleep behavior, display problems, slow boot.

• NVRAM reset — Shut down. Press power, then immediately hold Cmd+Option+P+R for 20 seconds.
• SMC reset — Varies by model. Apple’s support pages have the exact steps.

Where to stop

After step 7, your Mac should feel meaningfully faster. If it doesn’t, the problem is probably one of three things: a failing SSD, severely outdated hardware, or a specific app that’s broken. Activity Monitor will usually tell you which.

The tools I mentioned — Activity Monitor, Disk Utility, System Settings — are all free and built in. Sweep wraps the cleanup steps (caches, logs, language files, app leftovers, large forgotten files) into one scan with a preview before anything’s removed. Useful if you’d rather not spend an evening in Finder. Either way, the steps are the same.

A 2020 MacBook Pro can absolutely feel fast in 2026. A 2015 model can feel usable. Most of the gap between “slow” and “fast” is software, and software is fixable.