First off- this plugin is amazing. The layout of it should be merged into core and I hope if it’s not, that something like it will be.
Secondly, I’m using this for a art gallery site. I have a custom post type Artist, and all of the artist images are added to this artist post type. There are some artists that have 15 images, some that have 30. Now, these are definitely large (.jpg) files, nothing over 1MB but the AJAX loading spinner for Inline Attachments/Media Gallery at the bottom of the post just runs for about 20 seconds before displaying the list of attached photos and I don’t get it.
Sure the argument can be made that if you have 100 images, it would of course take longer than 10 images- but these are just small thumbnails that are being loaded, no? Perhaps I am not understanding the way that WordPress is generating/loading the thumbnails for this plugin (or for the general Media Gallery), but I would really hope it’s not loading the massive, original full-size images. If so, maybe I can turn that off?