A slow Mac is usually caused by too many login items, a full disk, runaway processes, or outdated macOS. This guide covers 9 proven fixes to get your Mac running fast again.
In this guide
Open Activity Monitor (Spotlight → Activity Monitor). Sort by CPU% and look for any process consuming over 30% consistently. Common culprits: mds_stores (Spotlight indexing — temporary), kernel_task (thermal management — check ventilation), and browser tabs. Sort by Memory to find RAM hogs. Quitting a single runaway process often restores performance immediately.
Go to System Settings → General → Login Items. Remove everything you do not need at startup — Dropbox, Spotify, Teams, Creative Cloud, and similar apps all launch background processes from the first second. On older macOS: System Preferences → Users & Groups → Login Items. Each item removed reduces boot time and frees RAM for your actual work.
macOS uses free disk space for virtual memory and system functions. Below 10% free space, performance degrades noticeably. Click the Apple menu → About This Mac → Storage → Manage. Use the built-in tools: Optimize Storage removes watched TV/movies, Empty Trash Automatically cleans old files, and Reduce Clutter shows large files by category. Target keeping at least 20GB free.
For Intel Macs: SMC reset — shut down, hold Shift+Control+Option+Power for 10 seconds, release, power on. PRAM reset — restart, immediately hold Command+Option+P+R for 20 seconds. These resets fix thermal throttling, battery reporting, display issues, and various system slowdowns. For Apple Silicon Macs, SMC/PRAM concepts do not apply — restart and the system resets equivalent settings automatically.
System Settings → Accessibility → Display → Reduce Motion. Also check Reduce Transparency. These settings disable parallax effects, blurring, and animations that consume GPU resources. On older Macs (pre-2019), this alone can make the UI feel noticeably more responsive. Also in Dock settings, turn off "Animate opening applications" and set "Minimize windows using" to Scale Effect.
Reinstalling macOS does not erase your files. Restart, hold Command+R (Intel) or hold Power (Apple Silicon) to enter Recovery Mode. Select Reinstall macOS. This replaces system files with clean copies and fixes software corruption. Your apps, files, and settings remain intact. This is the nuclear option for software issues — equivalent to Windows sfc /scannow but for the entire OS.
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