Modern cameras and mobile phones take high res photos which are large in size and reduce page load times.
If the user was prompted with an option for images to choose the size: Full, Large, Medium and Thumbnail this would help to reduce disk usage and improve page load times.
This is similar to how WordPress media images are inserted into Posts/Pages.
WordPress says "Dramatically improve the quality of re-sized images by making WordPress use ImageMagick instead of standard GD image library"
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