There's another overlooked issues regarding the slow federation. And I just found out a few days ago, there's de-peering drama since mid February that caused a huge of delays from APAC to Europe.

https://www.thinkbroadband.com/news/9896-ntt-cogent-peering-dispute-increasing-latency-for-some-routes

https://www.reddit.com/r/networking/comments/1cu13bv/cogent_depeering_tata/

Around that time until now, I had trouble accessing some sites, like I couldn't access some github projects, f-droid repos also failed, and also some websites. I've tried cloudflare warp, it didn't help either.

And if I'm not mistaken our admin has a solution to this issue a while ago, you may ask Dave.

https://lemmy.nz/post/10046390