The first twenty mentions (note: Mention) of an entity (note: Entity) are in the served HTML; the rest loads from a JSON fragment (note: Fragment) specific to that entity. Never a global index (3 passages, no note).
The fragment is fragments/<id>.mentions.json, written for every entity another note cites (6 passages, no note). Under two hundred mentions in all, the rest also travels in the page inside a data block, so that revealing it costs no request (31 passages, no note); beyond, the page fetches the fragment on demand, and over file://, where a page may not fetch, it links (note: Link) to it. The threshold (note: Publication threshold) of twenty is build.mentions_inline.