Google recently launched a New Web Site to help developers to make the web faster. In this website they have posted some articles which will be useful for developers. Google Speed Tutorials CSS: Using every declaration just once How gzip compression works HTTP caching Improving website performance with Page Speed Minimizing browser reflow Optimizing JavaScript code Optimizing web graphics PHP performance tips Prefetching resources Properly including stylesheets and scripts Reducing the file size of HTML documents UI messaging and perceived latency