From 1b89bee09826ee017ab439bab98e24a892e445bf Mon Sep 17 00:00:00 2001
From: Classic298 <27028174+Classic298@users.noreply.github.com>
Date: Sun, 1 Mar 2026 19:44:59 +0100
Subject: [PATCH] perf: add fast-path comparison in MultiResponseMessages
 (#22100)

Same optimization as ResponseMessage: add O(1) fast-path check on content and done fields before falling back to full JSON.stringify comparison. Avoids expensive serialization when only content changes during streaming.
---
 .../chat/Messages/MultiResponseMessages.svelte           | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/lib/components/chat/Messages/MultiResponseMessages.svelte b/src/lib/components/chat/Messages/MultiResponseMessages.svelte
index 87a46ce9b5..ae2be93ff2 100644
--- a/src/lib/components/chat/Messages/MultiResponseMessages.svelte
+++ b/src/lib/components/chat/Messages/MultiResponseMessages.svelte
@@ -62,8 +62,13 @@
 
 	let message = structuredClone(history.messages[messageId]);
 	$: if (history.messages) {
-		if (JSON.stringify(message) !== JSON.stringify(history.messages[messageId])) {
-			message = structuredClone(history.messages[messageId]);
+		const source = history.messages[messageId];
+		if (source) {
+			if (message.content !== source.content || message.done !== source.done) {
+				message = structuredClone(source);
+			} else if (JSON.stringify(message) !== JSON.stringify(source)) {
+				message = structuredClone(source);
+			}
 		}
 	}