This example resized image is under 7k and is larger pixel wise than the app profile thumbnails.

. This is just some random image a guy did off this thread and if the source image were better, so would be the result.

If it got really crazy, a lazy loader could go get and resize at higher quality when the scrolling stops, and you can always dispose the originals https://stackoverflow.com/questions/46149206/how-to-resize-image-without-losing-quality