Depends on your application and style of development. In my experience Node.js is almost always much faster than Ruby/Python and in some cases it's much faster

Depends on your application and style of development. In my experience Node.js is almost always much faster than Ruby/Python and in some cases it's much faster than Java Spring type apps for certain types of network applications (mainly io bound web apps serving a lot of small requests, the event loop async nature of node really shines there). It's not C/C++ or pure Java or Go type of speed but for a lot of web application development? Node.js is great performant choice.