It will be interesting to see if [Crystal](http://crystal-lang.org/ http://crystal-lang.org/) ever gets a port of Rails. Crystal currently has some serious limi

It will be interesting to see if [Crystal](http://crystal-lang.org/ http://crystal-lang.org/) ever gets a port of Rails. Crystal currently has some serious limitations that I think would make it all but impossible to port (e.g. lambda support is weak), but perhaps those issues will be remedied. And if so, Crystal on Rails would be 4x to 20x faster than on Ruby. On the other hand, I think [Phoenix](http://www.phoenixframework.org/ http://www.phoenixframework.org/) could be the next big web thing. Not b/c it is super fast (although still faster than Rails) but b/c it is super stable and easily distributed. The big advantage of Node.js (and thus Sails) is, of course, that the front end and back end can be written in the same language (ie. less to learn), but that might change in a few years with [WebAssembly](https://medium.com/javascript-scene/what-is-webassembly-the-dawn-of-a-new-era-61256ec5a8f6 https://medium.com/javascript-scene/what-is-webassembly-the-...).