I see you are really smart Fran!
Of course when i said it makes it slower was when it’s not publishing the post and uploading the picture. It makes it slower during the normal WordPress usage. I discovered that with “P3 (Plugin Performance Profiler)”. And i realized the diference after uninstalling it.
anyway, i don’t consider flicker dead (there is a great community out there), and still thing would be great to have a plugin like to yours, that allowed us to chose what pictures to upload from our post gallery.
if you wanna do that on your plugin, i’m available to help you with feedback. just let me know.
best!