If Async Javascripts is set to "async" you can try changing Autoptimize's Javascript Method to "async" as well. This might help improving performance, but on the other hand might break things, so test to see if this is useful.

Please follow the Japanese Style Guide. Ex: 1-2 (Hankaku/Zenkaku), 1-4(space) https://ja.wordpress.org/team/handbook/translation/translation-style-guide/

Comment Reason: Style Guide