iOS VoiceOver with Braille keyboard

Hi All,

I am develop the a braille keyboard with iOS, when I testing the typing function in notes , the screen update is very slow after typing, we suppose the respond should been instance change, I am not sure how to setup voiceover setting.

does any document supply on this issue? or does a any guideline for this?

iOS VoiceOver with Braille keyboard
 
 
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