SPOF-O-Matic : Chrome extension for detecting and simulating frontend Single Points Of Failure. Detects likely third-party single points of failure as you browse and...
Dimensions Browser Extension : Measure between the following elements: images, input-fields, buttons, videos, gifs, text, icons. You can measure everything you see in the browser.
choo : A 4kb framework for creating sturdy frontend applications
Minimize round-trip times : An article on the best practices to apply in order to minimize HTTP round-trip times
Arora : Arora is a lightweight cross-platform web browser. It's free (as in free speech and free beer). Arora runs on Linux, embedded Linux, FreeBSD, Mac OS X...
The easiest way to measure your performance budget.