&gt;<i>&quot;If you&#x27;re not picking the JVM in 2016 to build your core services and web applications then you&#x27;re making a mistake that is going to cost you time and money either upfront in building things that already exist or later down the road when you start to need more performance and your RoR application isn&#x27;t cutting it anymore.&quot;</i><p>That sounds like a fantastic problem to have. Airbnb, Teespring, (Rap) Genius, Github and many others have run into it and I don&#x27;t see how one could wish more for a friend building out a new wep app in 2016.<p>The best part is that if you build quickly and hit scaling problems, you have the resources to invest into making your product performant. The second best part is that if you don&#x27;t hit scaling problems, at least you haven&#x27;t wasted time on optimizing something the market didn&#x27;t want.