Node.js provides an event-driven architecture and a non-blocking I/O API that optimizes your application throughput and scalability. One notable feature of Node.js is that it contains a built-in library to allow applications to act as a Web server without software such as Apache HTTP Server or IIS. You should expect more and more web development projects shifting towards a uniform web language with Node.js leading the way.
Run Things in Parallel
Node.js is by design single-threaded, which means that there are lots of synchronous components that can potentially lock up the entire application. Even though you may avoid synchronous methods in your own code, it’s still possible to inadvertently use an external library that has a blocking call – and this can seriously reduce performance. The best way around this is always use asynchronous APIs in your code, especially in performance critical sections. Keep this in mind as well when choosing third party modules to ensure an external library doesn’t revert to synchronous calls.
Use Gzip Compression
Gzip is a software application used for file compression and decompression. Most servers and clients today support gzip. When a gzip compatible browser requests a resource the server can compress the response before sending it to the browser, which can reduce time lag and latency. Make sure you use gzip both when you respond to clients and also make requests to remote servers, as it can really improve the overall performance of your application.
Keep Code Small and Light
In the age of mobile where application performance is so critical, it’s especially important to keep your Node.js code base as compact as possible to reduce latency and speed things up.
Don’t Use Node.js to Render Static Assets
One critical performance tip would be to render your static assets, such as CSS and images, on a standard webserver like Nginx. By arranging Nginx to serve your static content you will significantly reduce the load on your Node.js instance and in the process increase your performance.
Employ Client Side Rendering
Thanks to powerful new client side MVC frameworks like AngularJS and BackboneJS, it has become much easier for developers to create dynamic, one-page apps. These frameworks expose APIs that send JSON responses directly to the client rather than through the server. If you let Node.js render server-side then this sends back an HTML page for every request. Using client side rendering in your Node.js environment can dramatically save bandwidth and reduce latency.
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