Comparing RUM & Synthetic Page Load Times | High Performance Web Sites
November 14, 2012 5:30 pm | 14 Comments Yesterday I read Etsy’s October 2012 Site Performance Report. Etsy is one of only a handful of companies that publish their performance stats with explanations and future plans. It’s really valuable (and brave!), and gives other developers an opportunity to learn from an industry leader. In this article Etsy mentions that the page load time stats are gathere
@font-face and performance | High Performance Web Sites
MAJOR CORRECTION: @font-face only blocks rendering in IE when there is a SCRIPT tag above the @font-face declaration. (more info below) Last week I was reading Ajaxian (my favorite blog) and saw the post about @font-face. I had been wondering for a few months about how font files impact web performance, so I followed the story back to Zoltan Hawryluk’s original post: @font-face in Depth. A great r
Browser Busy Indicators | High Performance Web Sites
Each result is essentially a bitmask indicating whether the busy indicator was triggered. For example, the first result for “Chrome 27 (Mac OS)” and the “click link” test is TSCPRN. This means the Tab icon, Status bar, and Reload icon indicators were triggered; but the Cursor, Progress bar, and Network indicators were not triggered. A few notes about the indicators: The network indicator is only a
Self-updating scripts | High Performance Web Sites
Updates: Philip Tellis deployed this as part of Log-Normal’s snippet and found two problems. One is fixed and the other is still being investigated: The previous code had a race condition when beacon.js called document.body.appendChild before BODY existed. This was fixed. Some users reported the update.php iframe was opened in a new tab in IE8. I can’t repro this bug but am investigating. Analyzin
5a Missing schema double download | High Performance Web Sites
February 10, 2010 5:12 pm | 15 Comments This is the first of five quick posts about some browser quirks that have come up in the last few weeks. Internet Explorer 7 & 8 will download stylesheets twice if the http(s) protocol is missing. If you have an HTTPS page that loads resources with “http://” in the URL, IE halts the download and displays an error dialog. This is called mixed content and shou
JavaScript Performance | High Performance Web Sites
January 13, 2012 10:09 pm | 20 Comments Last night I spoke at the San Francisco JavaScript Meetup. I gave a brand new talk called JavaScript Performance that focuses on script loading and async snippets. The snippet example I chose was the Google Analytics async snippet. The script-loading part of that snippet is only six lines, but a lot of thought and testing went into it. It’s a great prototype
Don’t docwrite scripts | High Performance Web Sites
April 10, 2012 5:29 pm | 32 Comments In yesterday’s blog post, Making the HTTP Archive faster, one of the biggest speedups came from not using a script loader. It turns out that script loader was using document.write to load scripts dynamically. I wrote about the document.write technique in Loading Script Without Blocking back in April 2009, as well as in Even Faster Web Sites (chapter 4). It look
Roundup on Parallel Connections | High Performance Web Sites
I provide (some of) the settings for HTTP/1.0 in the table above because some of the blog discussions have confused the connections per server settings for HTTP/1.0 with those for HTTP/1.1. HTTP/1.0 does not have persistant connections so a higher number of connections per server is supported to achieve faster performance. For example, IE7 supports 4 connections per server in HTTP/1.0. In fact, AO
Loading Scripts Without Blocking | High Performance Web Sites
April 27, 2009 10:49 pm | 47 Comments This post is based on a chapter from Even Faster Web Sites, the follow-up to High Performance Web Sites. Posts in this series include: chapters and contributing authors, Splitting the Initial Payload, Loading Scripts Without Blocking, Coupling Asynchronous Scripts, Positioning Inline Scripts, Sharding Dominant Domains, Flushing the Document Early, Using Iframe
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F5 and XHR deep dive | High Performance Web Sites
(lack of) Caching for iPhone Home Screen Apps | High Performance Web Sites
App cache & localStorage survey | High Performance Web Sites