Javaバックエンド機能開発においてネットワーク接続数を最適化するにはどうすればよいですか?

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class ConnectionPool {
    private static final String URL = "jdbc:mysql://localhost:3306/mydb";
    private static final String USER = "root";
    private static final String PASSWORD = "password";
    private static final int MAX_CONNECTIONS = 10;

    private static List<Connection> pool = new ArrayList<>();
    
    static {
        try {
            for (int i = 0; i < MAX_CONNECTIONS; i++) {
                pool.add(DriverManager.getConnection(URL, USER, PASSWORD));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    public static Connection getConnection() throws SQLException {
        return pool.remove(0);
    }
    
    public static void releaseConnection(Connection connection) {
        pool.add(connection);
    }
}

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class ConnectionReuseExample {
    private static final String SERVER_HOST = "localhost";
    private static final int SERVER_PORT = 8080;

    public static void main(String[] args) throws IOException {
        Socket socket = new Socket(SERVER_HOST, SERVER_PORT);
        OutputStream out = socket.getOutputStream();
        InputStream in = socket.getInputStream();

        for (int i = 0; i < 10; i++) {
            String request = "GET / HTTP/1.1
" +
                    "Host: " + SERVER_HOST + "

";
            out.write(request.getBytes());
            out.flush();

            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(buffer)) != -1) {
                System.out.write(buffer, 0, bytesRead);
            }
        }

        socket.close();
    }
}

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.CompletionHandler;

public class AsyncIOExample {
    private static final String SERVER_HOST = "localhost";
    private static final int SERVER_PORT = 8080;

    public static void main(String[] args) throws IOException {
        AsynchronousSocketChannel client = AsynchronousSocketChannel.open();
        client.connect(new InetSocketAddress(SERVER_HOST, SERVER_PORT), null, new CompletionHandler<Void, Void>() {
            @Override
            public void completed(Void result, Void attachment) {
                String request = "GET / HTTP/1.1
" +
                        "Host: " + SERVER_HOST + "

";
                ByteBuffer buffer = ByteBuffer.wrap(request.getBytes());
                client.write(buffer, null, new CompletionHandler<Integer, Void>() {
                    @Override
                    public void completed(Integer result, Void attachment) {
                        ByteBuffer buffer = ByteBuffer.allocate(1024);
                        client.read(buffer, null, new CompletionHandler<Integer, Void>() {
                            @Override
                            public void completed(Integer result, Void attachment) {
                                buffer.flip();
                                byte[] data = new byte[buffer.limit()];
                                buffer.get(data);
                                System.out.println(new String(data));
                            }

                            @Override
                            public void failed(Throwable exc, Void attachment) {
                                exc.printStackTrace();
                            }
                        });
                    }

                    @Override
                    public void failed(Throwable exc, Void attachment) {
                        exc.printStackTrace();
                    }
                });
            }

            @Override
            public void failed(Throwable exc, Void attachment) {
                exc.printStackTrace();
            }
        });
    }
}