ui: reduce per-token render cost when streaming (#26053)

* performance harness - the empirical root Assisted-by: Claude Opus 4.8 * 210.36ms -> 2.67ms per streamed token Assisted-by: Claude Opus 4.8 * 11.58ms -> 0.62ms per streamed token Assisted-by: Claude Opus 4.8 * 22.02ms -> 3.33ms per streamed token Assisted-by: Claude Opus 4.8 * 3.07ms -> 1.36ms per streamed token at 40 messages Assisted-by: Claude Opus 4.8 --------- Co-authored-by: Zach Winter <dmtommy@icloud.com>
2026-07-24 22:09:46 +02:00
parent 96013c5112
commit 555881ebc8
18 changed files with 1037 additions and 35 deletions
@@ -0,0 +1,17 @@
+// Shared reactive fixture state for the Tier 1 perf harness.
+//
+// The wrapper component reads this module directly rather than taking props,
+// so the driver can mutate it without depending on how the test renderer
+// forwards props.
+
+import type { DatabaseMessage } from '$lib/types';
+
+export const perfState = $state<{
+	message: DatabaseMessage | null;
+	toolMessages: DatabaseMessage[];
+	isStreaming: boolean;
+}>({
+	message: null,
+	toolMessages: [],
+	isStreaming: true
+});