They are in the cache and if you set up caching properly they wouldn’t need to be downloaded at all. Set all jpg’s to have a week long cache life
The new FTB is still in progress, but that is still to long to load a page.
You might want to work on optimising your CMS, or else caching the HTML pages after they have been made to serve them. There doesn’t look like theres any changing parts so this shouldn’t cause you any problems.