腾讯大讲堂09 如何建设高性能网站

Users don’t care where their data lives. They just want to get their work done quickly and efficiently. They would prefer to do their work without opening three different applications and five different browser tabs. That means your applications need to share data and work well with other applications. So what can you do? Use XPages and Java, of course! Kathy and Julian will give you integration tips and examples of connecting your XPages apps to both IBM and non IBM technologies. Walk away with a head full of knowledge and a sample database full of working code. NOTE: this session is geared towards XPages and Java developers, beginners welcome! A presentation from Julian Robichaux (panagenda) and Kathy Brown (PSC Group).

200, 404, 302. Is it a lock combination? A phone number? No, they're HTTP status codes! As we develop Web applications, we encounter these status codes and others, and often we make decisions about which ones to return without giving much thought to their meaning or context. It's time to take a deeper look at HTTP. Knowing the methods, headers, and status codes, what they mean, and how to use them can help you develop richer Internet applications. Join Ben Ramsey as he takes you on a journey through RFC 2616 to discover some of the gems of HTTP.

This document summarizes Christopher Schmitt's presentation on adaptive images in responsive web design. The presentation covered: 1. Using the browser width, screen resolution, and bandwidth to determine the appropriate image to serve through feature testing rather than browser sniffing. 2. Techniques for serving responsive images including using .htaccess files, the <picture> element, and JavaScript libraries like HiSRC that select images based on various tests. 3. Workarounds for older browsers including using background-size: 100%, SVG images, and font-based solutions.

As programmers, we concentrate so much on the server/backend side of things that we often forget to measure performance from the Client's viewpoint. This presentation describes a bunch of techniques that can be used to speed up our websites.

This document discusses tuning web performance from a frontend perspective. It covers the impact of performance on user experience, development tools for optimization like Firebug and Chrome DevTools, and various techniques for website optimization including reducing requests, optimizing images, leveraging caching, minimizing JavaScript, and improving loading efficiency. The goal is to provide an overview of concepts and tools for optimizing frontend performance.

Things to be aware of when you are measuring the performance of your web sites (both synthetic testing and Real User Monitoring).

The document discusses configuring CQ security. It covers security basics, denial of service attacks, repository attacks, access control, and dispatcher configuration. For denial of service attacks, it recommends protecting CQ with a firewall, caching resources, and limiting selectors. For repository attacks, it notes POST requests can manipulate content and install bundles, so access must be restricted. It describes CQ actions, permissions, and how ACLs are evaluated in CQ.

A web performance optimisation case study presented by Seatwave at the London Web Performance Meetup, Jan 2011. The PDF is in Landscape so you might be better to download it and then shift-ctrl-+ to rotate it clockwise in Adobe Acrobat Reader.

This document discusses various techniques for managing user experience and preferences on macOS, including: - Using the defaults command to modify system and application preferences through NSUserDefaults and CFPreferences. - Managing proprietary application preferences which may store settings in custom locations rather than the system preferences. This requires examining application documentation and potentially using scripts. - Configuration profiles, which define settings that can be installed via MDM or by double-clicking a profile file. Profiles set preferences that cannot easily be changed by users. - Considering whether defaults, scripts, or profiles are best suited based on the environment, applications, and specific settings being managed.

The document discusses various techniques for improving front-end website performance, including reducing the number of HTTP requests, using content delivery networks and caching, gzip compression, optimizing CSS and JavaScript loading, image optimization, and lazy loading of content not visible initially. Specific techniques mentioned include combining files, setting long cache expiration headers, minifying files, parallelizing downloads, and deferring non-critical JavaScript initialization. The goal is to render an initial version as fast as possible through optimizations that reduce page load time.

There have long been links on the internet that take the unwary user to a page with unexpected or malicious content. Most of these attempts rely on the user to click on the link to be successful. However, the latest variation has moved beyond simple text links to "Google-image poisoning" - placing malware in the middle of Google searches for images where users have traditionally had no reason to be wary. Our presentation will focus on How malware writers are able to infect the average website; detailed analyses of the PHP script used to infect s ites and SEO techniques to get infected images at the top of search results.

Sample code: https://github.com/cqsupport/webinar-dispatchercache Webinar Recording: http://my.adobeconnect.com/p7th2gf8k43/ Optimizing dispatcher cache covering: Best practices for using the dispatcher Tips and tricks for improving performance Common pitfalls to avoid How to design your site so you get the most out of your Dispatcher

The document discusses how remote apps allow developers to integrate third party applications into Atlassian's OnDemand service. Remote apps use a simple descriptor file to register the app and define things like permissions, pages, and macros. This avoids the complexity of developing plugins and allows apps to be built using any programming language. Examples are provided of how to create a Lucidchart diagramming app using remote apps.

This document discusses optimizing Joomla templates for high performance. It recommends tools like Firebug and YSlow to measure performance, and optimizing assets like JavaScript, CSS, and images. JavaScript should be moved to the end of the page, unused code removed, and files minified and compressed. CSS should be moved to the head and stripped of unused rules. Images can be optimized by using sprites, compression, and delivery via a CDN. The optimization process involves these techniques applied at each stage of development.

The document provides an overview of developing high performance web applications, focusing on optimizing front-end performance. It discusses why front-end performance matters, and provides best practices for optimizing page load time, developing responsive interfaces, and efficiently loading and executing JavaScript. The document also covers DOM scripting techniques, tools for profiling and analyzing performance, and how the performance monitoring service Gomez can be extended to better measure client-side metrics.

The document discusses techniques for improving website performance, including: 1. Focusing on front-end optimizations as they account for 80-90% of response time. 2. Following the 80/20 rule - optimizing the 20% of code that affects 80% of response time like assets on the front-end. 3. Using techniques like image sprites, combined scripts and stylesheets, CDNs, caching, gzip compression, and reducing cookie sizes and HTTP requests to improve response times.

This document discusses techniques for improving web performance. It begins with research on how caching and cookies impact performance. It then outlines 14 rules for optimizing performance, such as making fewer HTTP requests, using content delivery networks, gzipping components, placing scripts at the bottom of pages, and avoiding redirects. Case studies demonstrate how following these rules can significantly improve page load times. The document emphasizes starting performance improvements by focusing on front-end optimizations and advocates evangelizing best practices.

The document provides 14 tips for optimizing website performance based on the 80/20 rule. The tips include minimizing HTTP requests by combining files, using a CDN, adding caching headers, gzipping files, optimizing CSS and JS placement, avoiding redirects and duplicate scripts, and making Ajax cacheable. Following these best practices can significantly improve page load times by reducing network requests and making better use of browser caching.

Day 6 of 7-days "JavaScript and Rich User Interfaces" training for my colleagues. It covers ways how to speed up your application.

Analysis of Google Page Speed Insight Tool - Improve Website Development Standards using Google`s Page Speed Insight Tools

Modern progressive web applications are complex pieces of software running in the browser. Fastly offers unparalleled control over the way the bytes fly from your servers to the user, enabling many of the features of advanced progressive web apps to truly shine. This talk will show how these latest web technologies can best take advantage of smarts in the network to deliver your web app at top speed.

The document discusses various techniques for optimizing the front-end performance of websites, including minification, CSS sprites, domain sharding, image optimization, and HTTP caching. It provides examples and best practices for each technique to reduce file sizes, HTTP requests, and load times to improve user experience.

Cache is King discusses the importance of caching for website performance. It shows that enabling caching through techniques like setting Cache-Control headers can reduce page load times significantly. Specifically, using max-age to set expiration times for cacheable assets avoids unnecessary HTTP requests. For dynamic content, no-cache must be used to prevent caching. The document advocates being explicit with caching directives and measuring caching behavior to identify opportunities to optimize websites for cached access.

The document discusses optimization of the presentation tier of web applications. It notes that the presentation tier is often overlooked despite being responsible for over 30% of client/server performance. Some key optimizations discussed include reducing HTTP requests, optimizing response objects by reducing size and load pattern, JavaScript minification and placement, image sprites, caching, and ensuring valid HTML markup.

Google Developer Days Japan 2009 - Designing OpenSocial Apps For Speed and Scale Original slides from Arne Roomann-Kurrik & Chris Chabot with a few Zen quotes and references added by me:-)

We all know that site speed matters not only for users but also for search rankings. As marketers, how can we measure and improve the impact of site speed? Mat will cover a range of topics and tools, from the basic quick wins to some of the more surprising and cutting-edge techniques used by the largest websites in the world.

Presentation given in WP Meetup in October 2019. Includes fresh new tips from summer/fall 2019! A Must read for all WordPress site owners and developers.

The document provides a performance test analysis of the hotels.com website. It identifies several opportunities to improve performance, including: reducing the number of HTTP requests by combining files; using a content delivery network to improve response times; compressing components with gzip; avoiding redirects; using cookie-free domains; minifying JavaScript and CSS; not scaling images in HTML; and reducing cookie size. Implementing these recommendations could help speed up page loading.

This document discusses ways to improve web performance for mobile users. It outlines goals like achieving a speed index between 1,100-2,500 and first meaningful paint within 1-3 seconds. Various techniques are presented for hacking first load times, data transfer, resource loading, images and user experience. These include avoiding redirects, using HTTP/2 and service workers, modern cache controls, responsive images, preloading resources, and ensuring consistent frame rates. The overall message is that mobile performance needs more attention given average load times and high bounce rates on slow mobile sites.

This document discusses responsive image techniques for adaptive web design. It begins by explaining browser sniffing versus feature testing, and recommends using feature testing to determine browser width, screen resolution, and bandwidth instead of browser sniffing. It then covers techniques like using background-size to control image sizes, SVG for smaller file sizes, and font-based solutions. The document also discusses server-side techniques like .htaccess rewrite rules and client-side techniques like picture and HiSRC. It advocates for a mobile-first approach using CSS media queries and a single pixel GIF for responsive images.

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.

The document discusses optimizing frontend performance. It recommends reducing HTTP requests by combining CSS files into one file and using sprites and data URIs for images. It also suggests automating minification, compression, and image optimization. Performance should be monitored using tools like WebPagetest, YSlow, and PageSpeed. Frontend optimizations like these can reduce page load times and bandwidth usage.

While the principles of responsive web design can make sites look better on mobile devices, they don’t necessarily load faster than a site designed for desktops. And as more and more sophisticated WordPress themes emerge, with their multiple options and fancy sliders, websites just keep getting more and more bloated. This presentation will help cut out the junk that’s larding up your sites so you can better meet the demand of users wanting fast-loading user experiences–no matter the device or connection. Presented at WordCamp Salt Lake City 2013 (http://2013.slc.wordcamp.org/)

Salesforce Performance hacks - Client Side meetup slides http://www.meetup.com/Paris-Salesforce-Developer-User-Group/events/228006735/

The document provides best practices for optimizing frontend performance by reducing page load time. It discusses ways to reduce the number of HTTP requests, DNS lookups, redirects and duplicate scripts. It also recommends techniques like minifying assets, leveraging caching, prioritizing critical components, optimizing images and using content delivery networks.

Wrapper induction is a technique to automatically generate wrappers to extract information from web sources. It involves learning extraction rules from labeled examples to construct a wrapper as a finite state machine or set of delimiters. Two main wrapper induction systems are WIEN, which defines wrapper classes including LR, and STALKER, which uses a more expressive model with extraction rules and landmarks to handle structure hierarchically. Remaining challenges include selecting informative examples, generating label pages automatically, and developing more expressive models.

This document summarizes a tutorial given by Bing Liu on opinion mining and summarization. The tutorial covered several key topics in opinion mining including sentiment classification at the document and sentence level, feature-based opinion mining and summarization, comparative sentence extraction, and opinion spam detection. The tutorial provided an overview of the field of opinion mining and abstraction as well as summaries of various approaches to tasks such as sentiment classification using machine learning methods and feature scoring.

The document provides an overview of Huffman coding, a lossless data compression algorithm. It begins with a simple example to illustrate the basic idea of assigning shorter codes to more frequent symbols. It then defines key terms like entropy and describes the Huffman coding algorithm, which constructs an optimal prefix code from the frequency of symbols in the data. The document discusses how the algorithm works, its advantages in achieving compression close to the source entropy, and some limitations. It also covers applications of Huffman coding like image compression.

The document describes the DustBuster algorithm for discovering DUST rules - rules that transform one URL into another URL that contains similar content. The algorithm takes as input a list of URLs from a website and finds valid DUST rules without requiring any page fetches. It detects likely DUST rules based on a large support principle and small buckets principle. It then eliminates redundant rules and validates the remaining rules using a sample of URLs to identify rules that transform URLs with similar content. Experimental results on logs from two websites show that DustBuster is able to discover DUST rules that can help improve crawling efficiency.