June 2012
Intermediate to advanced
226 pages
5h 5m
English
Content preview from Web Performance Daybook Volume 2Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 13. Timing the Web
Analyzing the loading behavior of web pages by using browser plug-ins like YSlow, SpeedTracer or dynaTrace Ajax Edition has become really easy. As soon as we leave the browser, the story however is a different one. Getting detailed data from real users is much harder and only possible to a certain level of granularity. The usual approach is to use synthetic monitoring and execute tests from a variety of points of presence as close to end users as possible. If you measure from many locations and cover most of your transactions, this comes pretty close to the users’ perceived performance. In case you are interested in more details on the pros and cons of using synthetic monitoring, recommend this blog post (http://blog.dynatrace.com/2011/10/06/is-synthetic-monitoring-really-going-to-die/).
The best way however to understand the performance from a user’s perspective is to measure in the actual browser. While this sounds very simple, it turns out to rather be a challenge. Creating a waterfall chart like the one on Figure 13-1 by just using information available in the browser simply is impossible.
Although there are free libraries like Boomerang (https://github.com/yahoo/boomerang) and commercial products that can provide some of this information, it tends to be pretty tough. Actually of the first question that comes up is one of the hardest to answer: How long does it take to load a page. Let’s be more precise here. How long does it take from ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.