Web Performance Analysis & Optimization tools

 If you cannot measure it, you cannot improve it - Lord Kelvin

[Update:26-Dec-2016] - I got a chance to revisit the tools I listed below six years ago. I'll leave the original list as it is but below are what I would try in the future as they are extremely convenient to use -
  1. Chrome Developer Tools, Audit tab (F12 keyboard shortcut)
  2. Google Page Speed
  3. WebPageTest
  4. Web Page Analyzer
  5. DOM Monster
  6. YSlow
Following is the approach I would take to fix performance issues -
1. Run all the free perf tools to study the issues pointed out by them
2. Consolidate them based on which are serious & workable (not all suggestions may have easy fixes & there has to be a trade-off between usability, maintainability, security, SEO, cost & performance)
3. Make modifications & measure continuously

There are a bunch of free Web Performance Analysis & Optimization tools that web developers can take advantage of to build blazing fast web pages -
These tools provide suggestions that not just cut page download time but also operational costs. I learnt about some of these tools from web performance guru Steve Souders' blog

Also see:
HOW TO improve the front-end performance of a website
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