@primal appears to have also developed a relay-like interface for aggregating and fetching trending, popular, ... posts. Big work!
I think they used hamstr.to base which is Vue and really fast. It also uses regular relays in addition to their aggregator/cache relay. But not nos.lol :(
The dev is looking like a smart, experienced person. If this work continues it will be awesome for Nostr! I really wanted hamstr.to to continue!