so, you want the client to have a whole logic for scanning for every nip-19 prefix instead of the prescribed proper protocol nostr:
the editor, ok, not the presentation, that is gonna slow it down
idk if you have used coracle on mobile but it's heinously slow at rendering
it's become very slow on web too, and the logical reason is that there is so much extra work being done for whatever reasons... Postell's Law apparently, which i think is silly
i don't think scanning for backticks to render plaintext has any great impact though, but scanning for every one of the nip-19 entities is at least like 6 scans for each post before it can be rendered to html
