Betty Tso, Yahoo! and Marcel Duran, Yahoo!
(Abstract) In addition to existing Firefox/Firebug add-on, YSlow will be available for many browsers – Chrome, IE, Safari, Opera, as well as Mobile browsers and command-line. Please come join us to explore behind-the-scene techniques used to make this “universal” performance measurement tool possible, also find out how you can get involved in next-gen YSlow. There will be a quick sneak peak of upcoming features!
Betty is the manager of the Y! Property Performance team. They work on the YSlow product.
Marcel is the tech lead for the YSlow. YSlow is a web performance analysis tool for Firefox.
YSlow was tightly coupled to Firefxo, so they had to totally rewrite it to make it work cross-browsed. So they decided to go with a MVC model to devorce the heavy lifting from Firefox.
Last week, Y! announced YSlow for Chrome, but the Firefox version is still a bit more accurate, since Firefox plugins can span across domains, where Chrome cannot.
Another downside with the Chrome version is that there is no connection to the Chrome network panel, like we have with Firefox.
So the Chrome version is awesome, but the Firefox version is STILL more accurate, so looks like you can’t junk Firefox just yet. :(
What about mobile?
Just now, Y! is announcing that there is a new YSlow bookmarklet that will allow you to run YSlow on ANY mobile browser!!!
It is a bookmarklet that is injected using YUI without modifying the web page itself.
But AJAX cannot go cross-domain, so how can the bookmarklet actually work?
The solution is to use YSL, it is an open table that simulates the web browser on the server to get all the HTTP headers for YSlow to work.
The bookmarklet will load an iFrame to the page that will load the YSlow stats onto the iFrame for testing speed information. Marcel will write up more information at a later date.
The bookmarklet looks just like the desktop version of YSlow, but they are working on a mobile version on the YSlow views.
They will be open sourcing YSlow soon on GitHub!
Soon YSlow will be able to be translated in multiople languages!
One of the big things coming is the idea of exporting the tests and integrating them in your Continuous Integration solutions, like Hudson.
There will also be versions available as standalone JavaScript and a command line interface through node.js.
Thank you to Betty and Marcel for the talk!
