From a0d6c209c3027a8f453001915eadc798fb39c98a Mon Sep 17 00:00:00 2001
From: Classic298 <27028174+Classic298@users.noreply.github.com>
Date: Sun, 1 Mar 2026 19:37:10 +0100
Subject: [PATCH] perf: fast-path token comparison in CodeBlock (#22101)
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During streaming, every token change triggers a full JSON.stringify comparison on the code block token object. Add an O(1) fast-path check on token.text and token.raw — the fields that actually change during streaming — before falling back to the expensive JSON.stringify comparison for infrequent structural changes.
---
 src/lib/components/chat/Messages/CodeBlock.svelte | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lib/components/chat/Messages/CodeBlock.svelte b/src/lib/components/chat/Messages/CodeBlock.svelte
index ebd9892bc..a058b1545 100644
--- a/src/lib/components/chat/Messages/CodeBlock.svelte
+++ b/src/lib/components/chat/Messages/CodeBlock.svelte
@@ -364,7 +364,9 @@
 	};
 
 	$: if (token) {
-		if (JSON.stringify(token) !== JSON.stringify(_token)) {
+		if (token.text !== _token?.text || token.raw !== _token?.raw) {
+			_token = token;
+		} else if (JSON.stringify(token) !== JSON.stringify(_token)) {
 			_token = token;
 		}
 	}