Using WebPagetest: Web Performance Testing for Novices and by Rick Viscomi

By Rick Viscomi

Study simple and complicated makes use of of WebPagetest, the functionality dimension instrument for optimizing web pages. This useful advisor indicates clients new to this software how run exams and interpret effects, and is helping skilled clients achieve a greater and extra thorough knowing of hidden positive factors in WebPagetest that make checking out more uncomplicated. Written by means of WebPagetest strength clients and function specialists, this publication can help internet builders and frontend engineers remedy the matter of sluggish websites.

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The default quality is passable for recognizing prominent elements on the page but unsatisfactory for reading most text. Filmstrip and Video In the late 19th century a heated debate had developed over whether a horse in motion was ever completely unsupported midair or if it always had at least one foot on the ground. US Senator Leland Stanford commissioned Eadward Muybridge to photograph his galloping horse, “Sallie Gardner”, to settle the debate scientifically. Muybridge carefully positioned 24 cameras along a track to capture Stanford’s horse in action.

Reused connections share the preexisting security, avoiding the need to spend redundant time establishing another channel. Enabling connection reuse requires a change to the web server configuration; the Keep-Alive setting must be turned on. Fortunately, this is an easy and well-documented change. info | 23 Figure 2-17. Looking closely, you can see that many of these requests start with a small orange bar to indicate that new connections are being made. This is time that could otherwise be spent downloading the requested content.

The area above each line graph illustrates the amount of content not yet displayed at any given time. Remember that these two tests started and finished displaying content at exactly the same times! But the speed index isn’t fooled by a page that takes its time in the middle of the page load. We’ve seen how it works visually, so how is it computed? In calculus, an integral is used to calculate the area under a curve. If you’re getting anxious flashbacks to math class, don’t worry. The integral of the visual progress curve tells us the amount of content that has been displayed, but remember that we’re interested in the content yet to be displayed.

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