Thank you so much!! I bet the IP changed when we upgraded plans a few weeks ago. Can’t believe it was such an easy fix.
For whatever reason, changing that fixed the delay completely, and there’s no issues with Rank Math anymore. (We’d already been using Yoast before and having some performance issues, so I recently switched us over. In retrospect, it was probably just the server running out of memory and not Yoast specifically, but either way I’m happy not to have to switch plugins again.)
I’m also having this issue and confirmed that none of Gallery Ape’s three JS library options worked to fix it. Is there any more information you need from us to resolve this?