![]() But the writing is on the wall: 32-bits apps will cease working in macOS 10.15.Īpplication Not Optimized Upgrade Right AwaySo you need to establish a plan-it’s better to know what you’re going to do than to be forced into action if you have to replace your Mac on short notice. How Do You Identify 32-bit Apps?Apple provides a tool to help you find 32-bit apps. From the Apple menu, choose About This Mac and then click the System Report button. ![]() In the System Information utility that opens, scroll down to Software in the sidebar and select Applications. It may take a few minutes to build the list of every app on all mounted drives. Standalone applications run on Windows, Linux, and macOS corresponding to the platform on which they are generated.Apple’s M1 Macs are fast.It’s not just the hardware that’s responsible for that performance, howeverpart of that speed comes when apps have been properly optimized for Apple silicon.When it finishes, click the 64-bit column header (No means 32-bit Yes means 64-bit) to sort the list, and select an app to see its details in the bottom pane.This technique works in both High Sierra and Mojave, but in Mojave, System Information includes a better-formatted section, called Legacy Software, that also provides a list of 32-bit apps. What’s going on here, what should you do, and when should you do it? What’s Going On: 32-bit and 64-bit AppsOver a decade ago, Apple started to transition all the chips used in Macs, along with macOS itself, from a 32-bit architecture to a 64-bit architecture. ![]() ![]() Without getting into technical details, 64-bit systems and apps can access dramatically more memory and enjoy significantly faster performance.Apple knew it would take years before most people were running 64-bit hardware and 64-bit-savvy versions of macOS, so it allowed macOS to continue running older 32-bit apps. ![]()
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