By Rick Viscomi

Learn uncomplicated and complex makes use of of WebPagetest, the functionality size device for optimizing web content. This useful advisor indicates clients new to this device how run assessments and interpret effects, and is helping skilled clients achieve a greater and extra thorough knowing of hidden beneficial properties in WebPagetest that make checking out easier.

Written by way of WebPagetest energy clients and function specialists, this ebook may help internet builders and frontend engineers remedy the matter of sluggish websites. subject matters include:

  • Basic try out setup—shows novices the way to get significant results
  • Advanced attempt setup—provides one other point of technical intensity by means of explaining good points no longer completely documented at webpagetest.org
  • Analysis of results—helps you recognize of ways to interpret attempt results
  • Private example setup—teaches energy clients the intricacies of the webpagetest deepest example and the way it works
  • API and exterior tools—provides a close reference for the API and demonstrates instruments already utilizing the API to increase WebPagetest

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One or more unlucky resources are removed from the cache to make room for new ones. Even if a resource is in the cache and the user makes a request for that same resource, it may be served over the network if the cached version is not fresh. We will also look at the tools WebPageTest provides to measure how effectively a website uses browser caching. Before each test run, however, these caches are flushed to provide a clean and consistent environment. So if WebPageTest clears the cache before each test, how can we represent these use cases?

All of this color coding has nothing to do with connections, but it still adds some value to the diagram by making it easier to spot patterns and irregularities. Common Anti-Patterns So far, we’ve looked at ways of reading a waterfall to conclude that something is wrong. Spotting these anti-patterns takes some practice, so in this section we’ll look at a few common performance issues and their signatures. This isn’t to be conflated with the Time to First Byte (TTFB), which is one of a few phases of the initial request that can contribute to unacceptable first-byte times.

Not quite. Caching to the rescue. Even newer technology like solid state drives (SSDs) are slower to use than RAM due to hardware limitations. The next time one of these resources is needed, it can be served from cache instead of taking the slower journey across the Internet. One or more unlucky resources are removed from the cache to make room for new ones. Even if a resource is in the cache and the user makes a request for that same resource, it may be served over the network if the cached version is not fresh.

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