The forums ran from 2008-2020 and are now closed and viewable here as an archive.
ive never used deferred so i have no clue what it does.
when you say have the images load, do you mean have the thumbnails load?
what about the rest of the info and the google maps?
Frontend Masters is the best place to get it. They have courses on all the most important front-end technologies, from React to CSS, from Vue to D3, and beyond with Node.js and Full Stack.