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Mac Performance

Why a Mac slows down and how to find the cause: memory, CPU, disk, network and heat, explained with built-in tools and without cleaner apps.

Maxim points at a speed gauge in the green zone above a laptop; the holographic cat sits on the laptop
  1. · 4 min read kernel_task High CPU on a Mac: What It Is and What to Do kernel_task at 300% CPU, fans loud, Mac slow? That's the macOS kernel cooling the processor. How to find what heated it up and what to do next, step by step. Mac PerformancemacOS
  2. · 4 min read Mac Fan Loud: When It's Normal and What to Do MacBook or iMac fan loud for no reason? When fan noise is normal, how to find the app heating your Mac, and what to do on Apple silicon and Intel Macs. Mac PerformancemacOS
  3. · 5 min read MacBook Battery Health: Capacity, Cycle Count and When to Replace Where to check MacBook battery health, maximum capacity and cycle count, what Service Recommended means, and how to slow battery aging with macOS settings. Mac PerformancemacOS
  4. · 5 min read System Data Taking Up Space on a Mac: What It Is and How to Shrink It System Data in Mac storage at 100 GB or more? What's in it — Time Machine snapshots, caches, swap — how to find what grew and what you can safely remove. Mac PerformancemacOS
  5. · 4 min read WindowServer High CPU on a Mac: Why and How to Bring It Down WindowServer taking 30–80% CPU in Activity Monitor? It's the process that draws your windows. What loads it — displays, windows, effects — and how to test each. Mac PerformancemacOS
  6. · 7 min read Stats vs iStat Menus vs Activity Monitor: Compared An honest table: what Stats, iStat Menus, Activity Monitor and Mac Resources show, what they cost, where they live — and which monitor fits whom. Mac PerformancemacOS
  7. · 5 min read How Much Space an App Takes on a Mac and How to Remove It How to see an app's size on a Mac, where to find all apps sorted by size and how to remove an app completely, with its settings, caches and login items. macOSMac Performance
  8. · 5 min read How Much Has Been Written to a Mac SSD: Checking Wear macOS shows only the S.M.A.R.T. status. smartctl shows terabytes written, Percentage Used and Available Spare. How to read them and when SSD wear is a concern. Mac PerformancemacOS
  9. · 5 min read How to See Network Traffic on a Mac: Who Is Downloading Who is using the network and how much: per-app traffic in Activity Monitor and nettop, live speed in a desktop widget, and Low Data Mode. Mac PerformancemacOS
  10. · 5 min read Mac Temperature: Where to Check It and When to Worry Is your Mac running hot, and is that a problem? What macOS shows about heat on Intel and Apple silicon, where to get degrees and what to do. Mac PerformancemacOS
  11. · 6 min read MacBook Battery Drain: What Uses the Charge and Where to Look MacBook draining faster than usual? Where macOS shows battery usage by hour and by app, how to check battery health and what actually helps. Mac PerformancemacOS
  12. · 5 min read Mac Slow After a macOS Update: What's Normal, What Isn't After a macOS update, Spotlight indexing, Photos analysis and iCloud sync run for days. How to help them finish and when a slow Mac means a real problem to fix. Mac PerformancemacOS
  13. · 7 min read Menu Bar System Monitor for Mac: Which One to Choose CPU, memory and network load, even temperature, right in the Mac menu bar. What macOS shows by itself and what Stats, iStat Menus and Mac Resources can do. Mac PerformancemacOS
  14. · 6 min read How to Keep Your Mac Awake: Settings, caffeinate, the Lid Stop a Mac from sleeping with one setting in System Settings or the caffeinate command in Terminal. Display sleep vs. system sleep, and what a closed lid does. macOSMac Performance
  15. · 5 min read Swap on a Mac: How Much Is Normal and When to Worry Activity Monitor shows gigabytes of Swap Used? The number alone is no diagnosis: check memory pressure and whether swap grows. What's normal, what to do. Mac PerformancemacOS
  16. · 6 min read Why Is My Mac So Slow? A Step-by-Step Diagnosis Mac or MacBook running slow? Before you install a cleaner app, check memory, CPU usage, disk and heat in order and find the real cause. Mac PerformancemacOS
  17. · 5 min read Memory Pressure on a Mac: What Yellow and Red Mean Used memory on a Mac is almost always high, and that's fine. How to read the Memory Pressure graph, swap and compressed memory, and when RAM really runs short. Mac PerformancemacOS
  18. · 6 min read How to Check CPU Usage on a Mac: Activity Monitor Guide To check CPU usage on a Mac, open Activity Monitor, the Mac's task manager. What the CPU, Memory, Energy, Disk and Network tabs show and who is to blame. Mac PerformancemacOS
  19. · 5 min read Is 8 GB of RAM Enough for a Mac, or Do You Need 16? Other people's opinions on 8 vs 16 GB won't help. A week of watching memory pressure shows whether RAM is enough for your work and worth paying for. Mac PerformancemacOS