How to speed up image detecting using firebase_ml_vision of flutter package

I am using firebase_ml_vision to detect face in my apps... but it always takes too long to get the result of processing image when I am using camera.. it much faster when I am using image from gallery.. here is the part of the code

final image = FirebaseVisionImage.fromFile(imageFile);
        final faceDetector = FirebaseVision.instance.faceDetector(
            FaceDetectorOptions(
                mode: FaceDetectorMode.fast,
                enableLandmarks: false,
                enableClassification: false,
                enableContours: false,
                enableTracking: true));
        List<Face> faces = await faceDetector.processImage(image);

is there a way to speed up List<Face> faces = await faceDetector.processImage(image); when I am using camera? I have read this one (Slow face detection Firebase MLKit) and trying to do the same to firebase_ml_vision package but still can not speed it up