From 00c005aaea1fba26af3d961e5b0353c7cb3f5543 Mon Sep 17 00:00:00 2001
From: MarsLuay <70299537+MarsLuay@users.noreply.github.com>
Date: Tue, 25 Aug 2026 09:23:08 +0000
Subject: [PATCH] perf: batch thumbnail rendering with Promise.all in
 refreshThumbnailsAt

Concurrently execute slide thumbnail refreshes using Promise.all instead of sequentially awaiting each thumbnail in a loop.
---
 src/powerpoint/slideFilmstripController.ts | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/powerpoint/slideFilmstripController.ts b/src/powerpoint/slideFilmstripController.ts
index 4dcf73b..1ec0f09 100644
--- a/src/powerpoint/slideFilmstripController.ts
+++ b/src/powerpoint/slideFilmstripController.ts
@@ -320,9 +320,7 @@ export class SlideFilmstripController {
 
     const started = performance.now();
     const sorted = [...indices].sort((left, right) => left - right);
-    for (const index of sorted) {
-      await this.renderThumbnailAt(index);
-    }
+    await Promise.all(sorted.map((index) => this.renderThumbnailAt(index)));
     debugLog('render', 'PowerPoint thumbnail refresh completed', {
       indices: sorted,
       ms: Math.round(performance.now() - started)