takePictureAsync Base64 encoding performing slowly

Question

I'm trying to take picture with my expo react native app.

let uri = this.camera.takePictureAsync({
       base64: true
     }).then(data => {
         this.sendVisionOCR(data)
     }).catch(err => {
       console.log("err", err)}
     )

When running the function above it takes a very long time to log the base64 results and only seems to work sometimes.

How can it be faster?