If Google Japanese Input Conversion is Slow on Mac Big Sur, Check Full Disk Access

Addendum

The method introduced in the article below, "System Preferences -> Accessibility -> Check 'Increase Contrast'" is effective.

Dealing with the extremely slow Japanese input issue on Yosemite on MacBook Pro - Science Student Diary

Older Articles

The following content was tested around 2020, but it was not very effective.

If the conversion of Google Japanese Input is slow on Mac Big Sur,

In Security & Privacy -> Privacy tab -> Full Disk Access,

Check if GoogleJapaneseInput is checked. If not, check it.

Restart the Mac

Hold down the left Shift, Option, and Control keys while starting up.