YSlow 0.9.3 Release with Firefox 3 Support (Yahoo! Developer Network Blog)

My Projects
Tools & Services
APIs and Services
- Flickr
- Geo
- Mail
- Search
- Social
- Updates
- YAP
- YQL
Developer Tools
- Hadoop
- YUI
- YSlow
- View all »
Resources
- Blog
- YDN Theater
- Hack U

YDN YDN Blog YSlow 0.9.3 Release with Firefox 3 Support

Yahoo! Developer Network Blog

February 14, 2008

YSlow 0.9.3 Release with Firefox 3 Support

YSlow, the performance lint tool created by the Yahoo! Exceptional Performance team was updated to version 0.9.3. today. This minor version increment contains:
,

Firefox 3 support (up to and including 3.0b4pre)
Sortable table of page components in the Components tab
Beacons (1x1 images that are not part of the DOM) excluded from the overall score. If you want them back in the score, use about:config to set the option extensions.firebug.yslow.excludeBeaconsFromLint to false
Minor bug fixes that caused YSlow to freeze as it peels off the page components (encountering streams, applets, empty URLs)

In the spirit of openness and our commitment to a faster experience on the web, we hope you join us in accelerating the user experience.

You can download the tool here, report bugs here, read the performance rules, and participate in the performance mailing list discussions. Also make sure you keep an eye on our performance-related postings on YDN and YUI Blog.

Posted at February 14, 2008 5:40 PM | Permalink

Bookmark this on Delicious

Comments

Too bad the scores have shifted because of the beacon issue (my home page just gained 4 points, from 78 to 82.) There were a few sites that I just couldn't get scores on when I did the YSlow Performance Grades for 200 Top Web Sites survey last month. That 4th bullet fixes the issue (at least with Ancestry.com, one of the sites that failed before,) it's just skews the data since there are basically two scales at play now, so I'm hesitant to add in the missing data. Oh well.

Posted by: Rob at February 14, 2008 7:31 PM

Of course I could just read more clearly and see that there's an option to include the beacons which will level the playing field... *doh*

Posted by: Rob at February 14, 2008 7:37 PM

Rob, thanks for the interesting stats you have there (I searched for "YSlow Performance Grades for 200 Top Web Sites"). Good news is that the three sites that failed with the previous YSlow version before are now working. Sadly there's a lot of Fs, but that's why there's YSlow - to raise awareness that there's a problem and to suggest steps in the right direction.

Posted by: Stoyan at February 14, 2008 9:21 PM

..there's a bug in the new version, after upgrading to 0.9.3 my firefox just froze and until i disabled yslow i couldn't get it to start normally..

Posted by: dennis at February 15, 2008 3:21 AM

Same here, couldn't get firefox work until yslow was disabled.

Posted by: Olli at February 15, 2008 4:40 AM

Same bug (couldn't get firefox work until yslow was disabled.) with Firefox 2.0.0.12
Please fix it !

Posted by: fxoxo at February 15, 2008 8:19 AM

YSlow is not working. It appears in firebug, but nothing happend.

Posted by: macx at February 15, 2008 8:26 AM

Yup, with the latest yslow enabled, I could not load any pages, and restarting would not bring up the last session. I couldn't even load anything from bookmarks and my home page would not come up. Overall...broke firefox.

Posted by: gordon at February 15, 2008 9:06 AM

I believe there's some sort of conflict with the Tab Mix Plus extension.

Do you have this extension installed? If disable it and enable YSlow is everything back to normal?

I'll look into the conflict with Tab Mix Plus and update accordingly.

Thanks,
Stoyan

Posted by: Stoyan at February 15, 2008 9:17 AM

Yes, that's it.

In my case, it's YSlow that gets disabled. :)

Posted by: Casey at February 15, 2008 9:26 AM

"Sadly there's a lot of Fs, but that's why there's YSlow - to raise awareness that there's a problem and to suggest steps in the right direction."

Yeah, the numbers were pretty rough ( http://tinyurl.com/3e46oo if anyone is curious. posting a link didn't quite work the first time.) Lots of Fs and only a select few that even got into the B or better range.

Posted by: Rob at February 15, 2008 11:42 AM

YSlow was updated to 0.9.4. fixing the issue with the Tab Mix Plus extension.

Thanks everyone for the bug reports!
Stoyan

Posted by: Stoyan at February 15, 2008 6:00 PM

0.9.4 fixed the conflict with Tab Mix Plus for me. Thanks!

Keith D Commiskey

Posted by: GiftsForYou.Biz at February 18, 2008 7:59 AM

Thanks for the information on YSLOW.......and updated fix info

Posted by: Vectorpedia(Rick) at February 25, 2008 5:38 PM

Yslow 0.9.4 isn't working for me with Firefox 3.0b3 and firebug 1.1.0b12. I just get blank tabs. Anyone experiencing the same?

Posted by: Pepijn at March 3, 2008 4:25 AM

YSlow 0.9.4 with Firebug 1.05 on Firefox 2.0.0.12 on OSX 10.4 is reporting as note compatible. /shrug