Resource Prioritization

Periodic refresh and multi-stage download are design patterns for updating content. Periodic refresh checks the server at regular intervals for new information and notifies users. Multi-stage download loads basic functionality initially and additional components in the background over time to improve the user experience for both fast and slow connections. Examples include ESPN scoreboards, Gmail notifications, and Microsoft Start.com.

AJAX is a new approach to web application development that uses asynchronous JavaScript and XML to transmit small amounts of data in the background without interfering with the display and behavior of the existing page. Some key aspects of AJAX include asynchronous data retrieval using XMLHttpRequest, data interchange formats like XML/JSON, dynamic display using the DOM, and JavaScript binding it all together for a more responsive user experience compared to traditional full page loads. Common AJAX design patterns address issues like predictive fetching of likely next data, throttling frequent submissions, periodic refreshing of data, and multi-stage downloading of pages and components.

This document discusses various techniques for optimizing proxy server performance, including: 1) Establishing baseline performance metrics and monitoring the server to identify bottlenecks. Common bottlenecks include incorrect settings, faulty resources, insufficient resources, or applications hogging resources. 2) Caching web content and using proxy arrays, network load balancing, or round robin DNS to distribute load across multiple proxy servers for improved performance and high availability. 3) Monitoring server components like CPU usage, memory usage, disk performance, and network bandwidth to identify optimization opportunities.

View full webinar on demand at http://bit.ly/nginxbenchmarking Whether you’re doing performance testing or planning for infrastructure needs, benchmarking can be a big deal. Join us for this webinar where we cover NGINX benchmarking best practices, including: - the test environment - configuring NGINX - using benchmarking tools - and more! You’ll learn how to approach doing benchmarks so that you obtain results that are more accurate, better understood, and do a better job of addressing the needs of your project.

This document discusses WebSockets and their advantages over traditional AJAX polling for real-time applications like games and stock tickers. WebSockets allow for full-duplex communication over a single TCP connection, making them more efficient than polling approaches. They have become a standard in HTML5 and support on browsers is improving, though fallbacks like SockJS are still needed. Popular server-side implementations include Node.js and the Java WebSocket API integrated with frameworks like Spring. WebSockets also integrate well with messaging architectures using brokers like RabbitMQ. Security considerations include using WSS instead of WS and validating input/output.

Puru Hemnani - ICF Interactive The session will go over the advantages of CDN in general and Akamai caching in particular. Akamai is one of the most commonly used caching option with AEM and several clients use it. There are several features and akamai tuning options such as Error caching, GeoRouting, ESI, Siteshield, WAF that can help developers and system engineers make the sites faster and secure. Configuring it correctly can also reduce the licensing requirements for AEM as well as infrastructure costs as you can serve much higher amount of traffic with less number of origin servers.

Fastly VP of Technology Hooman Beheshti gives a keynote on The Future of CDNs at Software Practice Advancement Conference 2015. More resources: http://spaconference.org/spa2015/uploads/resources/SPA%202015%20KEYNOTE%20AND%20DIVERSIONS.pdf

The document discusses optimizing a server to handle high traffic loads on a tight budget. It describes how the default LAMP stack configuration is not adequate and leads to crashes under load. It then details several optimizations tried: increasing Apache and MySQL configuration limits, using Apache worker mode, adding OPcache and object caching with W3 Total Cache which improved performance by 500%. It also recommends splitting static and dynamic content using Nginx to further reduce load on Apache. With these optimizations, a single server could reliably handle the load.

CDNs improve content delivery over the internet by replicating popular content on servers located close to users. This allows users to retrieve content from nearby CDN nodes rather than distant origin servers, reducing latency. CDNs select the optimal server using policies like geographic proximity, load balancing, and performance monitoring. They redirect clients to CDN nodes using techniques like DNS responses and HTTP redirection. This improves the end user experience through faster delivery, lowers network congestion, and increases the scalability and fault tolerance of popular websites.

Slides from my presentation on web sockets at the HTML5 Developer Group Meetup on the 26th September 2013.

Integrating content delivery networks into your application infrastructure can offer many benefits, including major performance improvements for your applications. So understanding how CDNs perform — especially for your specific use cases — is vital. However, testing for measurement is complicated and nuanced, and results in metric overload and confusion. It's becoming increasingly important to understand measurement techniques, what they're telling you, and how to apply them to your actual content. In this session, we'll examine the challenges around measuring CDN performance and focus on the different methods for measurement. We'll discuss what to measure, important metrics to focus on, and different ways that numbers may mislead you. More specifically, we'll cover: Different techniques for measuring CDN performance Differentiating between network footprint and object delivery performance Choosing the right content to test Core metrics to focus on and how each impacts real traffic Understanding cache hit ratio, why it can be misleading, and how to measure for it

Proxy servers can be optimized through caching, load balancing, and monitoring performance metrics. Caching web content on the local network improves performance by reducing bandwidth usage and speeding up access. Load balancing techniques like proxy arrays, network load balancing, and round robin DNS distribute traffic across multiple proxy servers for high availability and optimized performance. Monitoring components like CPU usage, memory, disk usage, and network bandwidth helps identify bottlenecks and areas for improvement.

BlazeMeter is a cloud-based load testing service that is 100% compatible with Apache JMeter. It aims to simplify load testing for developers and testers by handling the infrastructure and providing an easy-to-use interface. Key features include the ability to run load tests with thousands of users in under 10 minutes, analyze response times and errors under different loads, and compare performance with caching enabled versus disabled.

Apache is the most popular web server in the world, yet its default configuration can't handle high traffic. Learn how to setup Apache for high performance sites and leverage many of its available modules to deliver a faster web experience for your users. Discover how Apache can max out a 1 Gbps NIC and how to serve over 140,000 pages per minute with a small Apache cluster. This presentation was given by Spark::red's founding partner Devon Hillard in March 2012 at the Boston Web Performance Meetup.

WebSockets allow for full-duplex and low-overhead communication between a client and server. They provide faster and more efficient transmission of data compared to traditional polling techniques. WebSockets are supported in modern browsers and enable use cases such as real-time updates in applications, online games, chat, and data streaming. Popular WebSocket libraries include Pusher and Socket.IO, which allow building WebSocket functionality into web and mobile apps.

In order to optimize server performance for whatsoever reason, you need to start by monitoring the server. In most cases, before server monitoring commences, it is common practice to establish baseline performance metrics for the specific server.

This document discusses high performance for WordPress. It provides information about Barry Abrahamson from Automattic and details about WordPress.com, which has over 13.5 million sites and 16 million users. It then discusses what performance means in terms of speed and scaling to serve many concurrent requests. Both client-side and server-side performance are examined, outlining techniques and tools to improve each. Real-world examples from WordPress.com show benefits from approaches like APC caching and HipHop. The document concludes with tips on improving performance as a user, sysadmin, developer, and scaling WordPress sites.

Slides on how to build your WordPress site so that it performs like an enterprise application. Associated video: http://wordpress.tv/2014/06/25/john-giaconia-enterprise-wordpress-performance-scalability-and-redundancy/

This session is recommended for people who are new to content distribution networks (CDNs) and have a need to decrease server load and speed up their website’s load time. In this mid-level technical session you will be able to learn more about improving the performance of web sites and web applications using Amazon CloudFront and Amazon Router 53. Learn how to assess whether your web applications will benefit from caching and how to optimize the delivery of static and dynamic content to boost performance and improve your customers' experience in using your applications.

1. A website is loaded by a browser through a multi-step process involving DNS lookups, TCP connections, downloading resources like HTML, CSS, JS, and images. This process can be slow due to the number of individual requests and dependencies between resources. 2. Ways to optimize the loading process include making the server fast, inlining critical resources, gzip compression, an optimized caching strategy, optimizing file delivery through techniques like CDNs and HTTP/2, bundling resources, optimizing images, avoiding unnecessary domains, minimizing web fonts, and JavaScript techniques like PJAX. Minifying assets can also speed up loading.

Amazon CloudFront and Amazon Route 53 can help optimize web application performance and availability. CloudFront improves performance by caching static and reusable content at edge locations and optimizing delivery of dynamic content through features like keep-alive connections and latency-based routing. Route 53 provides fast, reliable DNS services and can health check origins to improve high availability. Together, CloudFront and Route 53 provide a global network that caches content close to users and routes traffic based on network conditions to optimize performance and design for failure.

The document discusses the importance of site speed and provides tips to accelerate site performance. It notes that mobile speeds are especially important as mobile usage increases. It recommends techniques like using content delivery networks, optimizing images, removing sliders, and implementing resource hints. The document also describes tools for analyzing site speed like GTMetrix, WebPageTest, PageSpeed Insights, and Chrome's developer tools. It provides specifics on how to use these tools and what metrics they measure to identify performance issues.

This document provides practical strategies for improving front-end performance of websites. It discusses specific techniques like making fewer HTTP requests by combining files, leveraging browser caching with far-future expires headers, gzipping components, using CSS sprites, and deploying assets on a content delivery network. It also summarizes key rules from tools like YSlow and PageSpeed for optimizing front-end performance.

Traditionally, content delivery networks (CDNs) were known to accelerate static content. Amazon CloudFront has come a long way and now supports delivery of entire websites that include dynamic and static content. In this session, we introduce you to CloudFront’s dynamic delivery features that help improve the performance, scalability, and availability of your website while helping you lower your costs. We talk about architectural patterns such as SSL termination, close proximity connection termination, origin offload with keep-alive connections, and last-mile latency improvement. Also learn how to take advantage of Amazon Route 53's health check, automatic failover, and latency-based routing to build highly available web apps on AWS.

My talk at ScaleConf 2017 in Cape Town on some tips and tactics for scaling WordPress, with reference to WordPress.com and the container-based VIP Go platform. Video of my talk is here: https://www.youtube.com/watch?v=cs0DcY80spw

My presentation at Microsoft's Mountain View Conference Center during the "Talk Cloudy to me" day. Thanks to Sebastian and Scalr for a great day.

In this series of 15-minute technical flash talks you will learn directly from Amazon CloudFront engineers and their best practices on debugging caching issues, measuring performance using Real User Monitoring (RUM), and stopping malicious viewers using CloudFront and AWS WAF.

This document discusses building scalable Rails applications. It covers using multiple Rails processes and servers to handle concurrent requests. It recommends optimizing database queries, caching, offloading long tasks, and serving static assets externally. It also provides tips for load testing including using realistic data and environments, considering location and caching effects, and paying attention to request headers.

Presentation from the June 28, 2011 National Capital Area Google Technology Users Group on some of Google's efforts to make the web faster.

My talking points for the presentation on optimization of modern web applications. It is a huge topic, and I concentrated mostly on technical aspects of it.

Introduction to memcached, a caching service designed for optimizing performance and scaling in the web stack, seen from perspective of MySQL/PHP users. Given for 2nd year students of professional bachelor in ICT at Kaho St. Lieven, Gent.

This document discusses web performance optimization techniques. It is a summary of rules for web performance by Mark Tomlinson, who has 27 years of experience in performance. Some of the key techniques discussed include reducing HTTP requests, optimizing file compression, minimizing code, improving web font and image performance, prefetching resources, avoiding unnecessary redirects, and optimizing infrastructure and databases. The document emphasizes measuring performance through load testing and monitoring to identify bottlenecks.

At Tuenti, we do two code pushes per week, sometimes modifying thousands of files and running thousands of automated tests and build operations before, to ensure not only that the code works but also that proper localization is applied, bundles are generated and files get deployed to hundreds of servers as fast and reliable as possible. We use opensource tools like Mercurial, MySQL, Jenkins, Selenium, PHPUnit and Rsync among our own in-house ones, and have different development, testing, staging and production environments. We had to fight with problems like statics bundling and versioning, syntax errors and of course the fact that we have +100 engineers working on the codebase, sometimes merging and releasing more than a dozen branches the same day. We also switched from Subversion to Mercurial to obtain more flexibility and faster branching operations. With this talk we will explain the process of how code changes in ourcode repository end up in live code, detailing some practices and tips that we apply.