Velocizzare scansione con Socket

import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;

public class Main {

    public static void main(String[] args) {
        String ip = "192.168.1.185";
        System.out.println("===Scanning " + ip + "===");
        try {
            ExecutorService es = Executors.newFixedThreadPool(10);
            int timeout = 200;
            List<Future<ScannerResult>> list = new ArrayList<>();
            for (int port = 1; port <= 65535; port++) {
                list.add(portOpened(es, ip, port, timeout));
            }
            es.shutdown();
            int openPorts = 0;
            for (final Future<ScannerResult> f : list) {
                if (f.get().isOpen()) {
                    openPorts++;
                    System.out.println(f.get().getPort());
                }
            }
            System.out.println("L'indirizzo " + ip + " ha " + openPorts + " porte aperte");
        } catch (InterruptedException | ExecutionException ex) {
            System.out.println(ex.getMessage());
        }
        System.out.println("===END===");
    }

    public static Future<ScannerResult> portOpened(ExecutorService es, String ip, int port, int timeout) {
        return es.submit(() -> {
            try {
                Socket socket = new Socket();
                socket.connect(new InetSocketAddress(ip, port), timeout);
                socket.close();
                return new ScannerResult(port, true);
            } catch (Exception ex) {
                return new ScannerResult(port, false);
            }
        });
    }
}