I have decent benchmarks on major outbox implementations now in github.com/nostrability/outbox.
I have concrete suggestions on where to start for apps without outbox, and concrete improvements in increased coverage in thompson learning, and reduced load times by way of nip-66.
I have submitted PRs for consideration to rust-nostr (closed), coracle/welshman (open), NDK (open), applesauce (open) SDKs.
Lmk where to submit outbox PRs next. Note that some devs like PRs, and others dont.
cc
@sandwich