How to make Zxing scan barcode faster.

I use Zxing Barcode scan in my xamarin form app.
But when build Android it scan too slow, it take 30s -> 60s to scan 1 barcode.

                             public async void ScanButtonClicked(object sender, EventArgs s)
                                    {

                                        List<DACcode> scanResult = new List<DACcode>();
                                        var scanPage = new ZXingScannerPage()
                                        {
                                            //Hien thong bao huong dan tren giao dien quet
                                            DefaultOverlayTopText = "Read bar code",
                                            DefaultOverlayBottomText = "",
                                        };

                                        //Ham doi ket qua tra ve va xu ly ket qua
                                        scanPage.OnScanResult += (result) =>
                                        {
                                           //Neu viec Scan ket thuc tuc la da doc duoc code
                                            scanPage.IsScanning = false;
                                            Device.BeginInvokeOnMainThread(() => {
                                            Navigation.PopAsync();
                                            //Hien thi code tren popup
                                            DisplayAlert("Scan complete", result.Text, "OK");
                                            string scResult = result.Text;
                                        };
                                        //Quet xong tro lai ScanPage
                                        await Navigation.PushAsync(scanPage);
                                    }

How Can make it faster or someone have Barcode scan component use in xamarin form.