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 9. All about YSlow
Since 2007, millions of developers have been using YSlow to help them find out ways to make their web pages load faster. YSlow score has been the standard for Performance measurement in dev, QA, and production stages.
YSlow first started as a bookmarklet by Steve Souders while at Yahoo!, and soon became a popular Firefox extension. Over the past year, Marcel Duran built a YSlow Chrome extension, Opera extension, and Safari extension. In order to also support mobile devices as well as other browsers, YSlow was also made available as a bookmarklet in June 2011 with fresh shiny code and new architecture.
While speaking at Velocity China on
December 7, 2011, our team announced the release of YSlow for
Command Line beta, with courtesy to our FE tech lead, Marcel. This
version leverages Node.js and takes .har files as input
to generate YSlow score for a URL. Several output options are
available—JSON, XML, and plain text. Users can also pipe the result to a
beacon server, such as
http://www.showslow.com/beacon/yslow/ and view the result
in a graphical UI. For complete YSlow beacon spec, refer to the users’
guide.
In February 2012, YSlow was open sourced on Github and given a new home: yslow.org. Since then, YSlow has become a community-driven tool—within the first 24 hours of the open source announcement, there were 437 watchers and 37 forks.
While speaking at Amazon’s annual frontend conference in April 2012 (http://wh.yslow.org/amazon-wdc), Marcel Duran ...
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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.