A few weeks back we’ve already posted about YSlow, a free plugin from Yahoo that works on top of Firebug that additionally computes a performance grade report for your website.
A new version has now been released: YSlow v0.9.3, and one of it’s notable new features is that it works now on Firefox 3 beta3 and later. For those that didn’t try Firefox 3 yet, we can already say it improves rendering speed and uses a lot less memory then Firefox 2. Unfortunately not all the plugins have been made compatible yet with Firefox 3, so you may want to wait a bit before removing Firefox 2.
As a webdeveloper you’re probably already using the fantastic Firefox plugin Firebug. Features like inline editing of HTML, CSS, DOM inspection and HTTP requests viewer makes your developer life infinitely easier.
YSlow, a free plugin from Yahoo that works on top of Firebug additionally computes a performance grade report for your website.
Some of the rules it uses are:
- Make Fewer HTTP Requests
- Use a Content Delivery Network
- Add an Expires Header
- Gzip Components
- Put CSS at the Top
- Move Scripts to the Bottom
- Avoid CSS Expressions
- Reduce DNS Lookups
- Avoid Redirects
- Remove Duplicate Scripts
- Configure ETags
Implementing these performance improvements suggestions may speed-up your site greatly as according to Yahoo’s research almost 80% of the time is spent on the client side. So optimizing your Java server side code is not the only thing you should be focusing on 🙂