问AdMob间隙广告加载速度很慢

EN

loadInterstitial();

    findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (interstitialAd !=null) {
                interstitialAd.show(MainActivity.this);

                interstitialAd.setFullScreenContentCallback(new FullScreenContentCallback(){
                    @Override
                    public void onAdDismissedFullScreenContent() {
                        // Saat iklan ditutup
                        loadInterstitial();
                        startActivity(new Intent(MainActivity.this, Tips.class));
                    }

                    @Override
                    public void onAdFailedToShowFullScreenContent(AdError adError) {
                        // Saat iklan gagal muncul
                        Toast.makeText(getApplicationContext(), getString(R.string.on_ad_failed_show_fs), Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onAdShowedFullScreenContent() {
                        // saat iklan sudah muncul
                        interstitialAd = null;
                    }
                });
            }
        }
    });

    
private void loadInterstitial() {
    InterstitialAd.load(this, "ca-app-pub-0420793xxxxxxx/xxxxxx", new AdRequest.Builder().build(),
            new InterstitialAdLoadCallback() {
                @Override
                public void onAdLoaded(@NonNull InterstitialAd interstitial) {
                    // Saat iklan berhasil dimuat
                    interstitialAd = interstitial;
                }

                @Override
                public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                    // Saat iklan gagal dimuat
                    interstitialAd = null;
                    startActivity(new Intent(MainActivity.this, Tips.class));
                    Toast.makeText(getApplicationContext(), getString(R.string.on_ad_failed_to_load) + loadAdError.getMessage(),
                            Toast.LENGTH_SHORT).show();
                }
            });
}