via @devinsays Real-world connection simulator and bandwidth limiter for OS X
Could be a good tool for displaying metrics collected by StatsD.
This page tests “whether today’s browsers will download stylesheets that are referenced with media queries that would not apply on that browser or device.”
Thee appears to be a lot of download overhead with media queries using link elements.
“Page Speed Online analyzes the content of a web page, then generates suggestions to make that page faster. “
A “permanent repository of web performance information such as size of pages, failed requests, and technologies utilized. This performance information allows us to see trends in how the Web is built and provides a common data set from which to conduct web performance research.”
An excellent resource for testing and optimizing Web site performance. The information contained in the results is the most thorough of any I've seen.
Dave Rupert provides an excellent breakdown of how to speed up your WordPress-powered site. There's no excuse to not spend the time implementing these changes. Even if you're like me, and have already done a lot of the work, I'm willing to bet there's a step or two that will make your site even better. For me, it's the super-duper-easy cut-and-paste improvements to the htacess file to enable gzip and browser caching.
A quick way to compare the page load speed of two pages. Everything is done client-side, so you're comparing on your own network, which is great if you need to test a site yet to be in production.