The pin spreading on a dense country lets the page repaint as it works (a frame every 26 of its 260 passes, only when the print shows its progress); every sheet stays byte-identical

library/packet/poster-render.integrity.js

@@ -2,13 +2,13 @@
 // The sha384 of library/packet/poster-render.js. The browser fetches the served copy of that file
 // (<assets>/lib/poster-render.js), hashes it, and runs it only when it matches this pin: code loaded at
 // print time is integrity-pinned like every embed, because it executes on partner pages.
-export const POSTER_RENDER_SHA384 = 'sha384-AM43ejAFlUq5/1D5V/vIhQhohlg/xU6SmM3CRn53/AbULq+lVj+D/M9ylfd3+3ry'
+export const POSTER_RENDER_SHA384 = 'sha384-BovEYinyxyuBbZKenKq3jVNmVXHZG1qpEdznmgol7ceumR6r6KiKQhAQVg5Fs6yn'
 // The sha384 of library/scripts/posters/data/ne-places.json, served at <assets>/boundaries/ne-places.json.
 // Data, not code, but pinned the same way: a sheet uses the places only when they are the pinned ones.
 export const NE_PLACES_SHA384 = 'sha384-Qtz2q8mcnA9Ei8Kwa2MRMyX95hSbSnUXjXdtsy8rHTX++mgSCih4LO4Rdrb2MIQy'
 // The sha384 of the classic-script copy (<assets>/lib/poster-render.global.js, globalVariant of the file above),
 // loaded with <script integrity> where a page's policy forbids importing a blob: of the verified text.
-export const POSTER_RENDER_GLOBAL_SHA384 = 'sha384-3tatEkji15fqJiSe+XdnRxXotDEXRSnAq5rrwiqpx4UHd7vzJbidUvILn0YGe0rT'
+export const POSTER_RENDER_GLOBAL_SHA384 = 'sha384-p3Ua3UsjgZMKvcmxIsqFwdpqjtj+4DGNHSaA6+EqFqCPL27g3rrVRunEXeG7Qbaj'
 // The sha384 of library/scripts/posters/packet-strings.json, served at <assets>/lib/packet-strings.json. The
 // packet, list and card text in every language, fetched at print time (packet/packetStrings.js) and used only
 // when it matches; otherwise the print falls back to the bundled English block.

library/packet/poster-render.js

@@ -44,6 +44,11 @@ const __step = onStep
       return new Promise((r) => (typeof requestAnimationFrame === 'function' ? requestAnimationFrame(() => setTimeout(r, 0)) : setTimeout(r, 0)));
     }
   : () => undefined;
+// A yield WITHOUT a new step, for a long loop inside one stage (the pin relaxation): the page repaints (the elapsed
+// seconds tick) and the work resumes. A no-op without onStep, so the sheet is unchanged.
+const __yield = onStep
+  ? () => new Promise((r) => (typeof requestAnimationFrame === 'function' ? requestAnimationFrame(() => setTimeout(r, 0)) : setTimeout(r, 0)))
+  : () => undefined;
 // ── PIN BBOX: antimeridian-aware, outlier-trimmed ───────────────────────────
 // Two independent failure modes made three posters render the WHOLE GLOBE:
 //
@@ -1515,6 +1520,7 @@ async function renderPoster(zone, pins, zoneFC) {
     const ITERS = 260;
     for (const it of prePins) { it._ox = it._px; it._oy = it._py; }
     for (let pass = 0; pass < ITERS; pass++) {
+      if (pass && pass % 26 === 0) await __yield();   // ~10 repaints across the relaxation (dense countries: seconds on a phone)
       let moved = false;
       for (let i = 0; i < prePins.length; i++) {
         for (let j = i + 1; j < prePins.length; j++) {