WebView very slow on Android

In my Android application I'm using a WebView , but this is very slow for some content so it stops being useful. I have tried to update the WebView of the testing device but it has not contributed anything. I have also tried the following lines and none has served:

In AndroidManifest :

android:hardwareAccelerated="true"

In MainActivity :

webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    // chromium, enable hardware acceleration
    webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else {
    // older android version, disable hardware acceleration
    webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}

webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

I would like to know if there is any other way to optimize the use of WebView since the previous ones have not helped me.