64-bit apps are also capable of utilizing more memory than 32-bit ones, meaning they are able to perform faster, and much more smoothly.
Apple hasn't been quite that aggressive with the Mac yet, but the warning that the next major macOS version (presumably macOS 10.14) will not run 32-bit apps "without compromise" (like some sort of compatibility mode with limitations) still stands.
These apps will not be supported in a future version of macOS, Apple cautions. Apple said on Thursday, users will begin seeing a message when they boot up apps that supports the 32-bit in macOS High Sierra 10.13.4 that reads: "This app needs to be updated by its developer to improve compatibility", per Ars Technica.
Apple has begun notifying macOS users that 32-bit applications will not work on future versions of the operating system. Apple included a similar alert dialogue on 32-bit iOS apps with iOS 10.3 before requiring 64-bit support to launch on iOS 11 a year ago.
macOS has been 64-bit and 32-bit since 2005, and generally speaking if you purchased a new Mac in 2007 or later, its processor is 64-bit.
Once this transition is completed, MacOS will join iOS which is already pure 64-bit.
Apple's warning message also includes a link that takes the Mac users to the Apple support page for further information. The support page broadly explains Apple's plans to "eventually" require all Mac software to be 64-bit. It no longer accepts 32-bit apps for listing on the Mac App Store so it may not be long before it hammers in the final nail.
From the Apple menu, choose About This Mac, then click the System Report button. The alert will appear once per app when a user launches 32-bit software for the first when running the current macOS version. "No" means the app is 32-bit and needs to be updated, while "Yes" means it is 64-bit and will work just fine without further action from the developer. Then scroll down to Software and select Applications. The bar on 32-bit iOS apps was one of the key reasons the number of iOS apps in the App Store fell a year ago. Also, the company is already through the same transition to 64-bit in the iOS.
Apple started that process in 2013 with its first 64-bit mobile processor, the A7. For the next four years after the A7 chip, the company encouraged developers to move to 64-bit. There could be one on the developer's website, or in Apple's App Store.
If you've got the latest version of popular audio recording tool Audacity, the alert will state that, "Audacity is not optimized for your Mac". Second, desktop apps are downloaded from several other sources apart from the MacOS App Store.