How to speed up a Mac: fixes that work, in order

How to speed up a Mac without guessing

This guide is an ordered set of fixes for Apple silicon, covering macOS 15 Sequoia, macOS 26 Tahoe and macOS 27 Golden Gate. If you need help identifying the cause first, start with why your Mac is slow. A page that loads slowly, a full disk and a slow video export need different changes.

Choose one reproducible task: opening the same project, switching between the same apps or loading the same local document. Note what else is running. After each change, repeat that task under similar conditions. This won't produce a laboratory benchmark, but it stops an unrelated improvement being credited to the wrong fix.

1. Stop the work you don't need right now

Open Finder › Applications › Utilities › Activity Monitor, or find Activity Monitor with Spotlight. In Activity Monitor › CPU, sort the % CPU column and watch while the slowdown happens. Look for an app you recognize that stays busy, rather than treating a brief spike as a fault.

Save the app's work, then quit it normally with Command-Q if you don't need it. Closing a window may leave the app running. For a browser, close the particular tab doing work before closing the entire browser. An ongoing export or sync is often busy because you asked it to do something.

If an app is unresponsive, use Force Quit, understanding that unsaved work in that app may be lost. Don't force quit unfamiliar system processes just because they are near the top. Some restart automatically, and repeatedly stopping them can prevent their task from finishing.

Repeat the original task. If quitting an unrelated app made no difference, reopen it if needed and move on. If the slowdown always follows one particular document or website, keep that observation: it is more specific than “the Mac is slow”.

2. Reduce memory pressure, not cached memory

Switch to Activity Monitor › Memory. Apple's memory guidance says free RAM alone doesn't determine performance. Memory Pressure combines free memory, swapping and other factors to show whether the current workload fits.

When the graph stays green while the task is slow, don't assume a large Memory Used figure is the problem. macOS uses otherwise unused memory for cached files to help it reopen things. The cached number is not a pile that needs emptying.

If pressure rises into yellow or red alongside the slowdown, close a few memory-heavy things you can postpone: unused browser windows, a second project in a creative app or a virtual machine. Test again. An app whose memory grows while doing nothing may need an update or a restart; write down its name before clearing the evidence.

A restart can clear the current workload and relieve a leaking app temporarily, but it doesn't add memory. If your normal task reliably recreates pressure, change the workflow or consider a machine with more memory next time. Our RAM guide explains why a memory-cleaning utility isn't the same fix.

3. Make space if the startup disk is crowded

On all three versions, open System Settings › General › Storage. Let macOS finish calculating, then look at recognizable categories and files. Apple lists insufficient startup-disk space as one possible cause of slow operation, but it doesn't give a universal percentage that makes every Mac fast.

Move a large finished project to a backed-up external disk, remove an installer you no longer need, or review Downloads. Check the copy opens before discarding the original. Emptying the Trash makes those removals permanent; leave uncertain items there until you know they aren't needed.

Use the storage guide for the full order. Deleting a collection of tiny files while a large video or virtual machine fills the disk is unlikely to address the actual constraint. Don't delete unfamiliar system folders to chase a category name.

4. Trim optional login and background items

Open System Settings › General › Login Items & Extensions on macOS 15, 26 or 27. Review the apps under Open at Login. Remove only the ones you don't want opening automatically; this doesn't uninstall the app.

For a persistent startup slowdown, Apple's documented test is to record the login list, remove the items, restart, then add them back one at a time until the problem returns. A list or screenshot makes this reversible. An updater, sync client or hardware utility may provide something you still need, so check its role before disabling it.

Background permissions are a separate part of the same settings pane. Turning off an unfamiliar vendor at random can stop backups, syncing or device features. On an employer-managed Mac, ask IT about mandatory items. Our startup-items guide explains that distinction.

5. Update the problem app, then macOS

If the same app keeps hanging, look for its update before making system-wide changes. Check the App Store or the app's own Check for Updates command as appropriate. Read compatibility notes for your macOS and processor.

For macOS itself, use System Settings › General › Software Update. Back up before installation. Updates can correct software problems, but an update isn't a guaranteed speed increase for a particular workload. Follow the macOS update steps for compatibility and installation failures.

After a large update or photo import, keep the distinction between work progressing and work stuck. If an indexer or media-analysis process is busy, use the relevant process guide and let required work finish. Disabling Spotlight to make its CPU reading disappear removes search functionality and doesn't establish that the original bottleneck has been fixed.

6. Give the Mac room to cool

Put a laptop on a firm, stable surface, uncover the keyboard and keep ventilation clear. Apple specifies an ambient operating range of 10–35 °C (50–95 °F). This is room temperature, not a CPU-temperature target.

Pause an optional sustained workload while testing. A warm case during a demanding task is expected; persistent heat during light work deserves a closer look at CPU activity. Don't use a fan override or a “cooling” app as proof that the underlying workload is repaired. See the heat guide if this is where the evidence points.

If these changes don't help

Restart normally after saving work, then retest with only the required app open. If the fault persists, safe mode helps test whether startup software contributes. If the disk reports errors, the Mac restarts unexpectedly or an accessory consistently triggers the delay, treat that as a fault to investigate rather than normal maintenance.

Keep a short record: the task, app and macOS version, whether it happens in safe mode, and any error wording. Give that to the app developer or Apple Support. A clean reinstall is a substantial later step; it should not replace checking the app that actually fails.

Where Tend fits

Tend's free app list shows CPU, memory and estimated per-app watts, while Startup Items lets you switch your optional helpers off and back on. These readings help you choose what to investigate; a high estimate isn't a verdict that an app is faulty.

Pro can run a heavy app at low priority so other work has more opportunity to run. It doesn't make that app's task complete faster or add memory. Choose it when postponing background progress is the tradeoff you want.

Questions

Related guides

Sources

Sources checked 23 October 2026. These are documented steps and specifications; no repair, installation or performance test was run for this guide.

• Apple, If your Mac runs slowly — macOS 15
• Apple, If your Mac runs slowly — macOS 26
• Apple, View CPU activity in Activity Monitor
• Apple, Check if your Mac needs more RAM
• Apple, View memory usage in Activity Monitor
• Apple, Remove login items — macOS 15
• Apple, Remove login items — macOS 26
• Apple, Keep your Mac laptop within acceptable operating temperatures

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