Webdev:Cesium:Beacons

Overview

This page is for tracking beacon information from YSlow and PageSpeed. It is intended both as a reference and brainstorming tool.

YSlow Beacon Parameters

• w – size of the page in bytes (v1 sent size in kilobytes)
• o – overall YSlow grade calculated for the profile used
• u – URL of the page tested
• r – total amount of requests with empty cache
• s – page identifier for yahoo pages (like yahoo music, sports, etc), blank on non-yahoo pages
• i – testing profile used:
  • ydefault – YSlow (V2)
  • yslow1 – Classic (V1)
  • yblog – Small Site or Blog
  • or custom profile’s title with dash-encoded spaces
• ynumreq – Make fewer HTTP requests
• ycdn – Use a Content Delivery Network (CDN)
• yexpires – Add Expires headers
• ycompress – Compress components with gzip
• ycsstop – Put CSS at top
• yjsbottom – Put JavaScript at bottom
• yexpressions – Avoid CSS expressions
• yexternal – Make JavaScript and CSS external
• ydns – Reduce DNS lookups
• yminify – Minify JavaScript and CSS
• yredirects – Avoid URL redirects
• ydupes – Remove duplicate JavaScript and CSS
• yetags – Configure entity tags (ETags)
• yxhr – Make AJAX cacheable
• yxhrmethod – Use GET for AJAX requests
• ymindom – Reduce the number of DOM elements
• yno404 – Avoid HTTP 404 (Not Found) error
• ymincookie – Reduce cookie size
• ycookiefree – Use cookie-free domains
• ynofilter – Avoid AlphaImageLoader filter
• yimgnoscale – Do not scale images in HTML
• yfavicon – Make favicon small and cacheable
  

PageSpeed Beacon Parameters

Beacon Documentation: http://code.google.com/p/page-speed/wiki/BeaconDocs

Bug: http://code.google.com/p/page-speed/issues/detail?id=58

Future Beacon Parameters 

A future goal is to have YSlow and PageSpeed beacon detailed information about a page's performance. This can be in addition to a normal GET request. The URL parameters can have basic information while a larger response in the POST body can contain detailed statistics regarding a page's assets and score.

YSlow

• Page load time
• Number of JS files
• Number of CSS files
• Number of images
• Total size of components (HTML, JS, CSS, Images)
• Cached/uncached page weight
• Components that do not meet rules
  • URL 
  • Criteria

PageSpeed

TBD.