Download WhySlow

Free to download and explain. macOS 15 or later, Apple silicon and Intel. Notarized by Apple.

Download WhySlow.dmg

1. Open WhySlow.dmg and drag WhySlow into Applications.
2. Open WhySlow. It starts explaining right away.
3. Optional: turn on Start at login so WhySlow can learn how your Mac is used and tell you whether you need a new one.