Solved
How to handle datasource performance in multifield
Dears
I found that multifield seems to query the datasource every time when rendering data, which affects performance, is there a way to handle it?

Dears
I found that multifield seems to query the datasource every time when rendering data, which affects performance, is there a way to handle it?

You can do it client side as well.
https://aemlab.blogspot.com/2022/01/aemaacs-touch-ui-dialog-dynamic-dropdown.html
Use hidden field to store the authored multifield item dropdown value and set the drop from json response on dialog load.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.