• So … How fast is Groovy?
• First Java …

public class Fact {
    static final int N = 100000;
    public static void main (String[] args) {
	long start = System.currentTimeMillis();
	for (int i=0; i < N; i++) {
	    fact(10);
	}
	long delta = System.currentTimeMillis() - start;
	float t = ((float)delta) / N;
	System.out.println("Java:   "+(t*1000)+" MicroSeconds per call");
    }
    public static int fact(int n) {
	int result = 1;
	for (int i=2; i<=n; i++) {
	    result *= i;
	}
	return result;
    }
}

Java:   0.39000002 MicroSeconds per call