Does that app use Electron, Catalyst, SwiftUI, AppKit, or is it an iPhone app? How to find out easily.
Recommended for all users, as it also fixes a bug displaying the busy spinner, and improves detailed and text output.
From launch, through security checks, TCC and privacy, RunningBoard, to memory management and the Main Event Loop. A comprehensive summary.
iPadOS apps are written to use UIKit and features such as scenes. How can Catalyst get these to work in macOS, then?
When everything is running sweetly, macOS performance isn’t a problem. In most respects, though, 10.15 is no better prepared to cope with problems than 10.0 was almost 20 years ago.