From 9ca13c9a237d5d96a796f3c2b81be5cf1b18026b Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 23 Jun 2026 13:51:37 +0200
Subject: [PATCH] Sort the mappings *last* in the `readCmapTable` function (PR
 19321 follow-up)

This improves performance of `issue19319.pdf` even more, and locally the rendering time of the second page goes from ~300 ms to ~250 ms, since we avoid sorting a bunch of duplicate entries.
---
 src/core/fonts.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/core/fonts.js b/src/core/fonts.js
index dabdb4e84..0538c5e5c 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -1860,7 +1860,6 @@ class Font {
       }
 
       // removing duplicate entries
-      mappings.sort((a, b) => a.charCode - b.charCode);
       const finalMappings = [],
         seenCharCodes = new Set();
       for (const map of mappings) {
@@ -1876,7 +1875,7 @@ class Font {
       return {
         platformId: potentialTable.platformId,
         encodingId: potentialTable.encodingId,
-        mappings: finalMappings,
+        mappings: finalMappings.sort((a, b) => a.charCode - b.charCode),
         hasShortCmap,
       };
     }