There are glaring optimization issues.
Over 6MB of those 10MB is just one bloated photo [1]. It can be compressed down to 1-2MB. Moreover, if it was a proper responsive image, it would not be larger than 100-200 KB for most readers because a good JPEG compressor can pull 2 bits per pixel [2].
Ironically, image optimization apps don't get that much coverage.
[1] https://techcrunch.com/wp-content/uploads/2018/05/vikbajaj20...