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Google loves speed, and we want to make the entire web faster - yes, that includes your Rails app! We'll explore what we've learned from running our own services at scale, as well as cover the research, projects, and open sourced tools we've developed in the process. We'll start at the top with website optimization best practices, take a look at what the browser and HTML5 can do for us, take a detour into the optimizations for the mobile web, and finally dive deep into the SPDY and TCP protocol optimizations. We'll cover a lot of ground, so bring a coffee. By the end of the session, you should have a good checklist to help you optimize your own site.
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The video titled "Let's make the web faster - tips from trenches @ Google" presented by Ilya Grigorick at Rails Conf 2012 focuses on strategies to improve web performance based on experiences and methodologies developed at Google. In this talk, Grigorick highlights the importance of speed in web applications and provides valuable insights into optimizing user experience through various techniques. ### Key Points Discussed: - **User Experience and Speed**: Grigorick begins by discussing how users perceive latency, emphasizing that responses under 100 milliseconds feel instant, while delays over one second lead to cognitive disconnection. - **Current State of Web Performance**: He shares statistics from Google Analytics, noting average page load times exceed six seconds for desktop and ten seconds for mobile, revealing a concerning state for user experience. - **Measuring Web Performance**: Introducing the Navigation Timing API, Grigorick explains how it provides developers with detailed metrics on page loading times, including DNS resolution and TCP connection delays, allowing for better performance analysis. - **Optimization Techniques**: The speaker discusses various optimization techniques, such as leveraging browser caching, applying compression, and optimizing JavaScript loading through asynchronous scripts, to improve page speed and reduce loading times. - **Tools for Performance Analysis**: Grigorick showcases tools such as Chrome DevTools, Google PageSpeed Insights, and WebPageTest, underscoring their capabilities in diagnosing and resolving performance bottlenecks. He stresses the importance of histograms over averages for a more accurate understanding of performance distributions. - **PageSpeed Family**: Lastly, he introduces Google's PageSpeed family, including mod PageSpeed for Apache, which automates optimization processes by applying best practices in real-time without needing code changes. ### Conclusions and Takeaways: - Developing a speedy web presence requires a combined approach of measuring performance, understanding user perception, applying optimization techniques, and utilizing the right tools. - Mobile optimization is critical, with slower connections impacting performance metrics significantly. - Grigorick urges attendees to focus on user experience, utilize available tools, and build their own methods for ongoing speed improvements, ensuring the web becomes faster overall. By the end of the session, participants are encouraged to consider these insights as a checklist for optimizing their own applications, ultimately aiming for a faster web experience for all users.
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