“ But Python would be slower right ? Turns out it isn't and in fact for some of my datasets (that had over 100,000 users in them) it was 17 times faster. I also made sure that the Python version doesn't pull the entire nameservice into memory when it knows it is going to be filtering it based on the -l and -g options.”<p>Surely you can’t say it’s 17 times faster if you’ve changed the amount of data you’re actually dealing with? It’s not a like for like comparison.