1 files changed, 8 insertions, 0 deletions
diff --git a/lib/http.js b/lib/http.js
index 2bceaa0152..dacedd4477 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -855,6 +855,14 @@ OutgoingMessage.prototype.end = function(data, encoding) {
             this.connection.writable &&
             this.connection._httpMessage === this;
 
+  // The benefits of the hot-path optimization below start to fall
+  // off when the buffer size gets up near 128KB, because the cost
+  // of the copy is more than the cost of the extra write() call.
+  // Switch to the write/end method at that point.  Heuristics and
+  // magic numbers are awful, but slow http responses are worse.
+  if (hot && Buffer.isBuffer(data) && data.length > 120 * 1024)
+    hot = false;
+
   if (hot) {
     // Hot path. They're doing
     //   res.writeHead();