WhySlow

Small app.
Clear progress.

1.0.0 Current download

· Build 1 · macOS 15+

The first release brings plain-English performance diagnosis to Apple silicon and Intel Macs.

  • Overview with likely causes and suggested next steps.
  • Process explanations and guidance on what to leave running.
  • Background items, browser tools and internet checks.
  • Local usage history and upgrade advice.
  • Free explanations and license-based fixes.
Download 1.0.0

In preview

The website demonstrates expanded CPU and memory readings in the menu bar. These are not included in the 1.0.0 download. Explore the preview.

Getting updates

Use WhySlow’s update check to look for an available release, or return to the download page. Update checks contact whyslow.app; your process list and usage history are not part of the request.