Not a fan to the unnecessary images (don't think I have even poster one before) but it seems I'm guilty of the large images, just viewed some of your examples then revisited some of my created threads to cross-check and compared like;
The Xenophobic attacks on Africans by South Africans, what's your take on this and
Africa Cup of Nation Discussion Thread || Current Phase: Qualification and few others but notice I tried resizing the image as i can see I edited the image with the [width=***] code but in my defense, I'm using a mobile phone to access the forum so I might not be viewing the image as other advance smartphone users or those using a laptop to access the forum are, my bad.
I haven't received much complain also concerning my image size but as I review them it seems they're big. Apart from this one time
Honestly, I think it will be better if you present your contents in formal text, rather than infographics.
The infographics is hard to see, and space-consumed.
don't think it have ever occured to me, so maybe forum users should inform users regularly when they see this images so we can't adjust in time to make the discussion conducive to everyone.