This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl.

Apple's proprietary Apple silicon "M1" chip is designed based on the Arm architecture. Therefore, in order to run apps built for Intel's x86 architecture (for existing Mac models) on an M1-based Mac, the binaries must first be translated for Apple's silicon using Rosetta 2, which is implemented in macOS Big Sur.

So, one of the concerns is the time it takes to translate the binaries. In this regard, Microsoft revealed that the first time you launch the company's Office apps, you'll have to wait for about 20 seconds.

This is mentioned by the company in its FAQ for Microsoft 365 and Office 2019 support document for Apple silicon.

In response to the question "Are there any performance considerations for running Office under Rosetta 2 translation?", Microsoft said, "The first launch of each Office app will take longer as the operating system has to generate optimized code for the Apple Silicon processor. Users will notice that the apps 'bounce' in the dock for approximately 20 seconds while this process completes. Subsequent app launches will be fast."

The current page removes the description of about 20 seconds, but several media outlets, including ZDNet, document the fact that the above was written.

Apple itself has also acknowledged in its official developer documentation that Rosetta 2 translation process "takes time" and that users "might perceive that translated apps launch or run more slowly at times" as a result.

To avoid this translation process, Apple recommends that developers create a "universal binary". That is, you can put native codes for both the Intel chip and the Apple silicon in one app, and the Mac will determine which processor to use at runtime and choose the native code for each.


Microsoft is one of the third-party developers to adopt universal binaries, and the latest versions of Word, Excel, PowerPoint, Outlook, OneNote, and OneDrive are claimed to be optimized for Apple silicon (since the November release of build 16.43).

Anyway, if it only takes a while to boot up for the first time, you should be able to use your favorite macOS apps the same way you've always used them. The three new Mac models with the M1 chip will be released on November 17. We're also waiting for the actual user’s report.

Source: Microsoft, Apple

Via: MacRumors

This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl. The Japanese edition of Engadget does not guarantee the accuracy or reliability of this article.