From e031fadc356472912ca0defef2fb1151e39fc7c5 Mon Sep 17 00:00:00 2001
From: Algorithm5838 <108630393+Algorithm5838@users.noreply.github.com>
Date: Wed, 17 Jun 2026 03:57:02 +0300
Subject: [PATCH] perf: skip highlight.js auto-detection in read-only code
 blocks (#25824)

---
 src/lib/components/chat/Messages/CodeBlock.svelte | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/lib/components/chat/Messages/CodeBlock.svelte b/src/lib/components/chat/Messages/CodeBlock.svelte
index 7e38592533..c422708bdf 100644
--- a/src/lib/components/chat/Messages/CodeBlock.svelte
+++ b/src/lib/components/chat/Messages/CodeBlock.svelte
@@ -563,8 +563,10 @@
 								result) &&
 								'border-bottom-left-radius: 0px; border-bottom-right-radius: 0px;'}"><code
 								class="language-{lang} rounded-t-none whitespace-pre text-sm"
-								>{@html hljs.highlightAuto(code, hljs.getLanguage(lang)?.aliases).value ||
-									code}</code
+								>{#if lang && hljs.getLanguage(lang)}{@html hljs.highlight(code, {
+										language: lang,
+										ignoreIllegals: true
+									}).value}{:else}{code}{/if}</code
 							></pre>
 					{/if}
 				{:else}