diff --git a/src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/SocketOutput.cs b/src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/SocketOutput.cs
index ef74217d12d2..2017b1297bb5 100644
--- a/src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/SocketOutput.cs
+++ b/src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/SocketOutput.cs
@@ -89,7 +89,7 @@ public async Task WriteAsync(
                         ChunkWriter.WriteBeginChunkBytes(ref writableBuffer, buffer.Count);
                     }
 
-                    writableBuffer.Write(buffer);
+                    writableBuffer.WriteFast(buffer);
 
                     if (chunk)
                     {