The images are being scaled to size relying on the visitor's browser rather than being stored in the correct size on the webserver.
For example, the top row, second from the left is scaled to 240×180px although the actual image itself is still 2592×1944px. Just scaling this way in the HTML still means the entire 2.5Mb file needs to be loaded to display a small picture. It's probably a fault or a "feature" of the application you are using to create the site.
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