WebPagetest : Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds.
boomerang : boomerang is a piece of javascript that you add to your web pages, where it measures the performance of your website from your end user's point of vie...
High Performance Browser Networking : Performance is a feature. This book provides a hands-on overview of what every web developer needs to know about the various types of networks (WiFi, ...
Phoenix : Phoenix is a web development framework written in Elixir which implements the server-side MVC pattern. Many of its components and concepts will seem f...
Browser Calories : The easiest way to measure your performance budget.
It displays a menu with links that load other bookmarklets including Firebug Lite, Page Resources, DOM Monster, SpriteMe, and CSSess. The Mobile Perf menu is updated as new bookmarklets are released - so you get the latest tools automatically.