Ask HN: What are some examples of high performance Node.js apps?

Node was specifically built with performance in mind, which is one of the reasons it embraces the async I/O programming model so heavily. In addition, JavaScript runtimes such as v8 are some of the most optimized and engineered pieces of software ever made. Nevertheless it feels like most (non-web browser) JavaScript applications are pretty slow and resource inefficient. What are some counter examples to this?