From 8a8653ddb6173dc2ea20d692eaa3e194c41c283d Mon Sep 17 00:00:00 2001
From: ri7116 <ri711628@gmail.com>
Date: Fri, 8 Aug 2025 21:41:48 +0900
Subject: [PATCH] lib: optimize writable stream buffer clearing

Improved the `clearBuffer` function
by replacing `buffered.splice` with `ArrayPrototypeSlice`.
- Eliminates O(N) shifting overhead.
- Improves CPU utilization and reduces GC overhead.
---
 lib/internal/streams/writable.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/internal/streams/writable.js b/lib/internal/streams/writable.js
index 1081db9ffcf661..67beef44142d44 100644
--- a/lib/internal/streams/writable.js
+++ b/lib/internal/streams/writable.js
@@ -784,7 +784,7 @@ function clearBuffer(stream, state) {
     if (i === buffered.length) {
       resetBuffer(state);
     } else if (i > 256) {
-      buffered.splice(0, i);
+      state[kBufferedValue] = ArrayPrototypeSlice(buffered, i);
       state.bufferedIndex = 0;
     } else {
       state.bufferedIndex = i;