Helpful web analyzer which gives detail of site load time and give suggestion to improve their performance

This post lists 3 most useful FireFox addons that will help you analyze web page load time as you browse:

1. YSlow

YSlow is the official Yahoo! addon that integrates with Firebug. YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. When installed, it adds a tiny icon to FireFox status bar which shows the current page load time:



2. Google’s Page Speed

Page Speed is a Firefox/Firebug add-on that performs several tests on a site’s web server configuration and front-end code. These tests are based on a set of best practices known to enhance web page performance.

Webmasters who run Page Speed on their pages get a set of scores for each page, as well as helpful suggestions on how to improve its performance.

It adds an extra tab to Firebug that allows to analyze current page speed:



3. LORI (Life-of-Request Info)

LORI (Life-of-Request Info) is an advanced FireFox addon that adds a status bar at the bottom right corner of Firefox and displaying:

  • TTFB: how long it took to see the first byte from remote server (from click to first byte received).
  • TTC: how long it took to display the page (from click to complete drawing of the page)
  • Page size (number of bytes used to display the page): this value includes both bytes fetched from network and bytes fetched from the browser’s cache.
  • Number of requests: number of requests used to fetch the page’s content (images, style-sheet, javascript ….). Again, this value include both network requests and cache requests.

Note: it looks like it is not compatible with current FireFox version but it is a classic tool for page load time analysis so I couldn’t help mentioning it. Please comment here once the addon is updated.