Safe to Quit
Guides

Why is my Mac slow, hot or loud?

Honest answers for people who do not use Activity Monitor. No cleaner, no scare numbers, no reinstall. Each guide says what is going on and the one thing worth doing.

Look up a process

Answers come from the same knowledge base the app uses: 369 parts of macOS, each with a plain-English line and a verdict.

Guides

GuideActivity Monitor on Mac, explained: every tab and column in plain EnglishA plain-English guide to Activity Monitor on Mac: what each tab and column means, which processes are macOS and which ar…GuideHow to force quit on a Mac: four ways, what you lose, and when to wait insteadForce quit on Mac with Option+Command+Esc, the Apple menu, the Dock or Activity Monitor. What you lose, when to wait 30 …GuideHow to free up space on a Mac: the order that recovers the most GB with the least riskFree up space on a Mac in the right order: Downloads and Trash, old iPhone backups, unused apps, mail attachments, Optim…GuideBackground items on Mac: what "Allow in the Background" means, which ones to turn offWhat Login Items & Extensions and the "Background items added" notice mean, how to find the app behind a vague entry, an…GuideMac camera light on: why it is green, which app is using it, and whether someone can watch youA green light by the Mac camera means an app is using it right now. How to see which app in Control Center, turn it off,…GuideMac memory pressure explained: what green, yellow and red mean, and when to actMemory pressure, not Memory Used, is the Mac memory number that matters. Green is fine, yellow means compression and swa…GuideMac network monitor: how to see which app is using your internet, with built-in tools and withoutActivity Monitor's Network tab shows which app is using your internet. What it, nettop and per-app monitors like LuLu an…GuideMacBook overheating and the fan is loud: what is making the heat, and what to doA hot MacBook means something is working hard; the fan is the cure. The usual heat sources, normal chip temperatures, wh…GuideMac slow after update: why the first 48 hours are slow and how to tell it is settlingAfter a macOS update, Spotlight, Photos and iCloud re-index everything for 24 to 48 hours. How to confirm that is the ca…GuideMacBook battery draining fast: daytime drain vs overnight drain, and how to find the causeFast drain in use is usually one app or tab running flat out. Drain with the lid closed means the Mac is being woken. Ho…GuidePurgeable space on a Mac: what it is, why the free space numbers disagree, and why not to fight itPurgeable space is storage macOS frees on demand: local snapshots, iCloud copies, caches. Why Finder and Disk Utility di…Guide"Your system has run out of application memory" on Mac: what it means and what to quitSwap is exhausted, not RAM full. One leaking app, browser tab or WindowServer is usually to blame. Find the grower in Ac…GuideIs it safe to close the MacBook lid while downloading? What stops, what keeps going, and how to keep it awakeClosing the lid sleeps a MacBook and pauses downloads, exports and backups, unless a display and power are connected. Th…GuideIs it safe to restart my Mac? When a restart helps, when it does not, and what you loseRestarting a Mac is always safe and often the right fix: memory leaks, a stuck WindowServer, after updates. The wrong fi…GuideIs it safe to unplug an external drive from a Mac without ejecting? What Eject does and what happens if you skip itPulling a drive without ejecting risks the last seconds of writes and, on exFAT or mid-backup, the whole volume. What Ej…GuideShould I clear the cache on my Mac? Usually no, and here is when the answer is yesClearing cache on a Mac rarely speeds it up and the space is back in days. When it helps (one misbehaving app, a stale s…GuideSystem Data on Mac: what is in it, why it is huge, and how to clear it safelySystem Data on a Mac is mostly Time Machine snapshots, app caches, iOS backups and developer files. What is safe to remo…GuideTime Machine local snapshots: what they are, why they fill System Data, and when to delete themLocal snapshots are hourly APFS copies Time Machine keeps on your Mac for 24 hours. Why they show as System Data, how to…GuideWhich browser tab is using the most memory? How to find it in Chrome, Safari, Firefox, Arc and EdgeFind the tab eating memory: Chrome's Task Manager, Safari Web Content rows in Activity Monitor, Firefox about:processes.…GuideWhy is my Mac so slow? The five real causes and a 60-second diagnosisA slow Mac has one of five causes: an app eating CPU, memory pressure, Spotlight indexing, heat or a full disk. Find you…

Cleaners, monitors and the honest answer

ComparisonBest Mac cleaner: the one built into macOS, plus three free tools for specific jobsThe best Mac cleaner is already installed: Storage settings and Finder. Add AppCleaner for uninstalls and DaisyDisk for …ComparisonIs CleanMyMac worth it? What it really does, and what macOS already does for freeCleanMyMac is a polished uninstaller and large-file finder. Its RAM and speed-up tools add little macOS does not already…ComparisonIs MacKeeper safe? Its history, what it is today, and whether you need itToday's MacKeeper is notarized by Apple and passes independent malware tests. Its history explains the distrust, and mos…ComparisonMac memory cleaner apps: why "free up RAM" is placebo on macOS, and what to check insteadMemory cleaner apps free RAM that macOS was using as a file cache, so it is re-read from disk a moment later. Memory pre…ComparisonMac temperature monitor: how to check CPU temperature and fan speed, and what the numbers meanNo built-in temperature readout on Apple silicon Macs. Stats (free), iStat Menus and TG Pro show it. Hot under load is n…

Processes explained

Every one of these has its own page. See the full A to Z.