Hi @angus, I can't be certain about what is actually happening, which needs an admin and knowledgeable person with the ActivityPub plugin, but I observe that this forum becomes slow or even unreachable at times and it looks to be related somehow to posts that are being federated.
Notified about that in this post, saw it happening yesterday after @silverpill tooted this reply, and I got "503 Gateway timeout" from NGINX which I think may relate to this post.
I also noticed that SH becomes unresponsive when I publish a reply. This is because replies are delivered to many other servers, which start to load the reply tree, all at once.
Sorry about that
if this is the case, then it is basically a "thundering herd" issue similar to how link previews can cause issues. to which the mitigation is that softwares should stop auto-fetching resources that might not ever be seen, and to instead use on-demand deferred "lazy loading" strategies.
Hey guys, I’ll have a closer look at this soon, hopefully tomorrow.
I disable my plugin for that trouble I’ve received many request no stop from the same souce-instance or many others instances making the same type of request without none delay limit, sorry but this is weird all time requesting and flooding my server is too much.