Benchmark puzzle

Benchmark.java

import java.util.function.IntSupplier;
import java.util.stream.IntStream;

public class Benchmark {
	private int compute() {
		IntSupplier s1 = () -> IntStream.range(0, 10000).map(v -> 1).sum();
		IntSupplier s2 = () -> IntStream.range(0, 10000).map(v -> 1).sum();
		IntSupplier s3 = () -> IntStream.range(0, 10000).map(v -> 1).sum();
		return s1.getAsInt() + s2.getAsInt() + s3.getAsInt();
	}
	
	private void measure() {
		int res = 0;
		// Warmup
		for (int i = 0; i < 20000; i++) {
			res += compute();
		}

		// Measurement
		long start = System.currentTimeMillis();
		for (int i = 0; i < 20000; i++) {
			res += compute();
		}
		long end = System.currentTimeMillis();
		System.out.println(res);
		System.out.println("Duration: " + (end - start) + "ms");
	}
	
	public static void main(String[] args) {
		new Benchmark().measure();
	}
}