From 945a0928c793c0bd8573e179583d983187e5f392 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 16 Nov 2022 12:09:33 +0000
Subject: [PATCH] Don't filter state in /context response (#14461)

We don't filter state usually, so doing so here is a waste of time. This is not much of an issue for clients that enable lazy loading of members, since there will be fewer state events.
---
 changelog.d/14461.misc   | 1 +
 synapse/handlers/room.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/14461.misc

diff --git a/changelog.d/14461.misc b/changelog.d/14461.misc
new file mode 100644
index 000000000..cdfa577a4
--- /dev/null
+++ b/changelog.d/14461.misc
@@ -0,0 +1 @@
+Improve performance of `/context` in large rooms.
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 66a50bca6..6dcfd86fd 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -1451,7 +1451,7 @@ class RoomContextHandler:
             events_before=events_before,
             event=event,
             events_after=events_after,
-            state=await filter_evts(state_events),
+            state=state_events,
             aggregations=aggregations,
             start=await token.copy_and_replace(
                 StreamKeyType.ROOM, results.start