Optimize ionic 3 iOS app to reduce data comsumption

I have a ionic3 iOS app that contain a lot of images for display(i.e.I am using img tag and each image is a URL and render the image in the app), and I discover a huge data usage problem and I want to optimize it. So I had search a solution for reduce the data usage. I have find this plugin https://www.npmjs.com/package/ionic-image-loader 1, but not working in iOS, and many peoples said it is because WKwebview & CORS. Any suggestion for this, thanks a lot.