Simon icon Simon
Flexible server monitoring

Introducing Simon 5!

Simon version 5 is now available. It is a massive update, introducing a much-requested feature: syncing the Simon data between multiple Macs, plus a Simon Status service, a Link Checker filter, improved Find filter, iMessage and Speak Error notifiers, a new app icon, and much more.

Important: please note that Simon 5 requires a minimum of macOS 10.12 (Sierra), and is a paid upgrade from Simon 4. Purchasers since September 1, 2020 automatically get a version 5 license (that also works in previous versions).

Read the Simon What's New page for details.

Excessive CPU

With just two sites to check Simon uses 10% of the available CPU while waiting for the timers to expire so as to perform the tests.
This is excessive.

David Sinclair's picture

Re: Excessive CPU

Try closing the Simon window and see if that makes a difference. Updating the window every second can use some CPU cycles, though usually not that much.

You can set a General pref to automatically hide the window when Simon isn't front-most.