From 9529de4cf2fcea8300522960296a7756b424a98f Mon Sep 17 00:00:00 2001
From: Georgios Konstantopoulos <me@gakonst.com>
Date: Sun, 15 Feb 2026 17:07:26 -0800
Subject: [PATCH] perf(engine): bound channels in spawn_tx_iterator by
 transaction count (#22205)

Co-authored-by: Amp <amp@ampcode.com>
---
 crates/engine/tree/src/tree/payload_processor/mod.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/engine/tree/src/tree/payload_processor/mod.rs b/crates/engine/tree/src/tree/payload_processor/mod.rs
index d0ad71d08a..e40c926ae2 100644
--- a/crates/engine/tree/src/tree/payload_processor/mod.rs
+++ b/crates/engine/tree/src/tree/payload_processor/mod.rs
@@ -392,9 +392,9 @@ where
         mpsc::Receiver<WithTxEnv<TxEnvFor<Evm>, I::Recovered>>,
         mpsc::Receiver<Result<WithTxEnv<TxEnvFor<Evm>, I::Recovered>, I::Error>>,
     ) {
-        let (ooo_tx, ooo_rx) = mpsc::channel();
-        let (prewarm_tx, prewarm_rx) = mpsc::channel();
-        let (execute_tx, execute_rx) = mpsc::channel();
+        let (ooo_tx, ooo_rx) = mpsc::sync_channel(transaction_count);
+        let (prewarm_tx, prewarm_rx) = mpsc::sync_channel(transaction_count);
+        let (execute_tx, execute_rx) = mpsc::sync_channel(transaction_count);
 
         if transaction_count == 0 {
             // Empty block — nothing to do.