If you have ever seen a notification like the above when attempting to do something on your computer, there are many valid reasons why the application is not responding. Each time I open SkySafari Pro on my laptop, it takes a very long time to load up ‘stuff’, and CleanMyMac X will show me a pop-up saying “Not Responding.” I just ignore it and close the pop-up rather than choose the option to “end program.” Eventually, the app opens. There’s no problem with the app or the computer. It’s just a really bulky program for macOS. The same app on my iPhone or iPad loads almost instantly.

There are other reasons for (Not Responding). Leo Notenboom (Ask Leo) gives a very good run-down on all the possibilities. Although Ask Leo is all about Windows, this article is also appropriate for the Mac.

https://askleo.com/not_responding_what_does_it_mean_and_what_do_i_do_about_it/

John R Carter, Sr.