cordova-plugin-camera-preview: Picture taking is very slow on iOS

I have implemented this wonderful plugin to my Ionic 2 iOS application but unfortunately taking a picture takes way too long. After taking the picture it takes about 5-10 seconds of time to draw it on the canvas. I have tried different picture qualities but changing this parameter doesn’t seem to change the time it takes to create the image.

Of course there is a possibility that I have done something wrong. If so, please feel free to correct me.

takePicture(e) {
    e.stopPropagation();
    this.cameraPreview.setFlashMode(this.flashMode).then(() => {
        this.cameraPreview.takePicture({ width: 3024, height: 4032, quality: 100 })
            .then((base64Data) => {
                // Draws the image on canvas
                this.drawImage(base64Data);
                this.closeCamera();
        });
    });
}

drawImage(b64Data: string) : void {
    let c = <HTMLCanvasElement> document.getElementById('temp_picture');
    let ctx = c.getContext('2d');

    let i = new Image();
    i.src = 'data:image/jpeg;base64,' + b64Data;
    i.addEventListener('load', () => {
        let cWpx = c.getAttribute('width');
        let cHpx = c.getAttribute('height');
        let canvasWidth = parseInt(cWpx.substring(0, cWpx.length - 2));
        let canvasHeight = parseInt(cHpx.substring(0, cHpx.length - 2));
        // Coef is calculated by height because width will be "cropped" away anyway
        // but height will always have to be 100%
        let coef = canvasHeight / i.height;
        let imageDrawWidth = i.width * coef;
        let imageDrawHeight = i.height * coef;
        let drawX = (canvasWidth / 2) - (imageDrawWidth / 2);
        let drawY = (canvasHeight / 2) - (imageDrawHeight / 2);
        ctx.drawImage(i, drawX, drawY, imageDrawWidth, imageDrawHeight);
    });
}

iphone 7 global packages: ionic/cli-utils : 1.4.0 Cordova CLI : 7.0.1 Ionic CLI : 3.4.0 local packages: ionic/app-scripts : 1.3.7 ionic/cli-plugin-cordova : 1.4.0 ionic/cli-plugin-ionic-angular : 1.3.1 Cordova Platforms : android 6.1.2 ios 4.3.1 Ionic Framework : ionic-angular 3.4.2 System: Node : v6.9.4 OS : macOS Sierra Xcode : Xcode 8.3.3 Build version 8E3004b ios-deploy : 1.9.1 ios-sim : 5.0.13 npm : 3.10.10