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I wouldn’t worry too much about the Ajax URL being printed several times on a page. It will still be faster than requesting entire file (media-models) from the server. While working with AJAX you will probably need more variables than Ajax URL for each script, so you will still use wp_localize_script on each.
Actually, the media-models will be always present on the post edit screen if your post type supports editor, because it’s used by the ‘Add Media’ button. That’s the good thing :)
That’s true, but I thought we were talking about frontend Ajax scripts. :)

I was talking about frontend ajax yes.

I’ll just stay with the multiple lines, since it’s a result of how wordpress is working with this at the moment. using localize script is the official way so i’ll stick with that.

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