...... loading the same post full of images over and over can be a bind....
I'm not certain on this, perhaps someone more geeky like Rusty will conform or discredit.
As each unique image has it's own unique URL, when a page calls for that unique URL multiple times, it only gets downloaded once using only the bandwidth required for a single download, the browser then locally positions the display of that single copy in multiple locations.
So, if that ^ is correct, there's no bandwidth penalty when displaying the same image multiple times on the same page, the visual clutter issue certainly remains and is often very annoying even on a desktop, much worse when viewing mobile.
Best would be where posters learn how and implement a post/reply method that removes all from the quote that has no relevance to the reply. Being as we are all perfectly flawed humans with widely varied knowledge and experiences, this is not likely to happen.
Hmm, to eliminate visual clutter, let's all learn to post at f1.2, narrow focus and depth of field, clutter be banished to Bokeh.
edit...... visual clutter applies to text that is needlessly quoted, most especially when multi-quoted, visual clutter is not limited to images.