TcpClient performance - sending 4 scalar values ​​is much slower than sending 1 byte array containing all values

Question

I am writing an application in which two applications (for example, a server and a client) exchange data through a TCP connection on a local hosting.

The code is pretty performance critical, so I try to optimize as best as possible.

Below is the code from the server application. To send messages, my naive approach was to create a BinaryWriter from the TcpClient stream and write each message value through a BinaryWriter. So let the message consist of 4 values; long followed by a Bolean meaning, and then two more long; naive approach:

TcpClient client = ...;
var writer = new BinaryWriter(client.GetStream());

// The following takes ca. 0.55ms:

writer.Write((long)123);
writer.Write(true);
writer.Write((long)456);
writer.Write((long)2);

With a runtime of 0.55 ms, it looks pretty slow. Then I tried the following:

TcpClient client = ...;

 // The following takes ca. 0.15ms:

var b1 = BitConverter.GetBytes((long)123);
var b2 = BitConverter.GetBytes(true);
var b3 = BitConverter.GetBytes((long)456);
var b4 = BitConverter.GetBytes((long)2);

var result = new byte[b1.Length + b2.Length + b3.Length + b4.Length];
Array.Copy(b1, 0, result, 0, b1.Length);
Array.Copy(b2, 0, result, b1.Length, b2.Length);
Array.Copy(b3, 0, result, b1.Length + b2.Length, b3.Length);
Array.Copy(b4, 0, result, b1.Length + b2.Length + b3.Length, b4.Length);

client.GetStream().Write(result, 0, result.Length);

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