From 59c1511bcacedddc354e82033d523f459c6db5d4 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 24 Oct 2026 20:28:36 +0200
Subject: cache heads

To reduce the number of write locks, heads are now cached.
---
 src/swarm/relay.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/swarm/relay.rs')

diff --git a/src/swarm/relay.rs b/src/swarm/relay.rs
index 454a46a..492b59d 100644
--- a/src/swarm/relay.rs
+++ b/src/swarm/relay.rs
@@ -52,6 +52,10 @@ pub(crate) async fn pull_if_behind(state: &AppState, peer: &str, remote: &transp
     if remote.epoch != state.local_epoch() || !topology::is_neighbour(state, peer) {
         return;
     }
+    // The common case, the same heads, needs only the cached heads (read lock).
+    if HeadsSummary::of(state.doc.read().await.heads().to_vec()) == remote.heads {
+        return;
+    }
     let missing = match &remote.heads {
         HeadsSummary::Heads(heads) => {
             // AutoCommit's lookups take &mut self.
-- 
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