It would be interesting for me…
Thank you!
Here is my site Read-Only: LINK
(how to share your site Read-Only link)
This is not webflow issue but css.
https://stackoverflow.com/questions/30450731/any-perfomance-issues-due-to-display-none
https://stackoverflow.com/questions/12158540/does-displaynone-prevent-an-image-from-loading
In modern browsers i think the answer is no.
According to Harry @csswizidry
Chrome, Opera, and Edge will download background-images that aren’t required for first render. >This means that hidden DOM nodes that have a background-image applied to them will still have >that background-image downloaded. Beware unexpected downloads.
Firefox will blockdownloads on CSSOM construction, meaning later-than-expected >downloads. Beware delays.
Further, Firefox will still download theeven if it wasn’t needed. Beware unexpected >downloads.
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Dear Webdev, thank you for this tipp 
Greets from Austria