Rikard,
You’re right on the two pages: one is a static text page and one is image heavy. I think what I was trying to say was, I expect the image heavy one to load slower, but I also expect the initial page load to be quick so the site itself is visible. Then the gallery masonry images can take their time loading the 7MB one at a time. If there were multiple pages with galleries, it would take 5 seconds to change between each page. Rather than change instantly and having to wait for each image to load one at a time.
Does that make sense? Is there anyway to optimize for that to happen?