Not all images are loading

Question

HTML

There are a lot of images on the site, so I decided to use parallel uploading of photos from different subdomains. But now, if you open a site without a cache, then many images do not load.
Error "Connection Error"
The problem occurs in all browsers
Images are always different and their number is the same
c2n.me/iiPML5

Answer 1

If you insert images with a script, then everything works fine.

Answer 2

What does it mean to upload photos in parallel? Browsers by default load images immediately. And you write aborted , as if hinting that most likely some of your script canceled the download