There are many many reasons, i have engineered the rust and C code to be fast and cache efficient. kotlin/jvm is a completely different runtime environment, and a naive implementation of a nostr client will be slow. Lots of careful engineering is the gist of it. I approached it like i would a video game with a very tight frame budget.

You're crazy, I often wonder how you learned all this low level stuff. Thanks for you for the well detailed response.