Download Web Performance: The Definitive Guide by Daniel Austin PDF

By Daniel Austin

Velocity is cash - and extending net functionality may have an important final analysis influence. This sensible advisor introduces a brand new version for brooding about end-to-end functionality that everybody, from builders to engineers and analyst, can simply comprehend. no matter if you need to write swifter purposes, or confirm web site is speedy forever, you will discover easy methods to in attaining functionality in a brand new manner. determine, prioritize, and examine difficulties, and then—most importantly - how one can optimize functionality.

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Extra info for Web Performance: The Definitive Guide

Sample text

This is one of the limitations of our model, and we’ll find that T4 is often more difficult to deal with than the other time segments. ), process the information in the context of whatever task they initially set out to perform, and respond accordingly. This becomes important when the user undertakes a serial sequence of events such as checking out of an online store, accessing email, or other activities that involve well-defined sequences of user events. Our simple single-object model allows us to break the total response time down into several steps and analyze them separately.

We need to gather several sample measurements to have a good idea of the overall response time. Let’s run the cURL command 10 times and gather the data. We’ll use a shell script to do this. Our script will stop for 1000 milliseconds between tests, based on the assumption that the request won’t take that long! The result should be a list with 10 numbers in it. The script on the companion site will also take care of converting the data values to milliseconds, which is the most common unit of measure for Web re‐ sponse times.

These are powerful ideas, and once grasped and applied they’ll form the basis for our approach to under‐ standing how the web works and why it takes so long. info | 39 • T4 - Client Processing Time By looking at some examples, we were able to measure response times for a single object using cURL and R to visualize the overall performance metrics. ) The three steps in the MPPC loading cycle are: • Step 1: load the ‘base page’ or initial DOM object • Step 2: load the secondary page objects via intransitive hyperlinks • Step 3: load ancillary content via ‘deferred loading’ We’ve also learned that transitive hyperlinks are those the user actuates of their own accord, and intransitive hyperlinks are those actuated on behalf of the user automatically by the user agent.

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