From 69713890a28249cecb8a9c4a821a781c0fc19641 Mon Sep 17 00:00:00 2001
From: 7w1 <noreply@sl.sable.moe>
Date: Sat, 18 Jul 2026 15:16:09 -0500
Subject: [PATCH] cache power levels, widgets, abbreviations, and banners

---
 .changeset/cache-sliding-sync-room-metadata.md | 5 +++++
 src/client/slidingSyncSidebarCache.ts          | 5 +++++
 2 files changed, 10 insertions(+)
 create mode 100644 .changeset/cache-sliding-sync-room-metadata.md

diff --git a/.changeset/cache-sliding-sync-room-metadata.md b/.changeset/cache-sliding-sync-room-metadata.md
new file mode 100644
index 0000000000..2f29d79fb5
--- /dev/null
+++ b/.changeset/cache-sliding-sync-room-metadata.md
@@ -0,0 +1,5 @@
+---
+default: patch
+---
+
+Cache room banners, abbreviations, power-level labels, and widgets for faster sliding sync warm starts.
diff --git a/src/client/slidingSyncSidebarCache.ts b/src/client/slidingSyncSidebarCache.ts
index 4aad4638d4..ed74105a72 100644
--- a/src/client/slidingSyncSidebarCache.ts
+++ b/src/client/slidingSyncSidebarCache.ts
@@ -1,6 +1,7 @@
 import type { MatrixClient, MSC3575RoomData, SlidingSync } from '$types/matrix-sdk';
 import { EventType, MatrixEvent, SlidingSyncEvent } from '$types/matrix-sdk';
 import { CustomAccountDataEvent } from '$types/matrix/accountData';
+import { CustomStateEvent } from '$types/matrix/room';
 
 const CACHE_VERSION = 1;
 const CACHE_KEY_PREFIX = 'sable.slidingSyncSidebarCache.';
@@ -37,6 +38,10 @@ const CACHED_STATE_TYPES = new Set<string>([
   EventType.RoomServerAcl,
   EventType.SpaceChild,
   EventType.SpaceParent,
+  CustomStateEvent.PowerLevelTags,
+  CustomStateEvent.RoomWidget,
+  CustomStateEvent.RoomAbbreviations,
+  CustomStateEvent.RoomBanner,
 ]);
 
 const emptyCache = (): SidebarCacheData => ({