Don’t know if it’s related but I’ve had trouble with the site loading slowly and this has caused double posting for me. I also noticed that the person who posted after me ended up triple posting as well.
Uploading 1 large image ain't that much of an issue... But try to open a thread that contains a large number of rather large image files.
I don't have a mega-fast glass fibre connection and viewing such threads/journals in my case isn't very pleasant waiting for all images to download.