Greetings, So I recall Kevin asking about it but here are some articles on Chrome DevTools testing tools. It's been there for a few years so really there is no excuse for not running your code through it or the audit feature. Not sure about Firefox's internal testing suite off hand: https://developer.chrome.com/docs/devtools/evaluate-performance/ https://developer.chrome.com/docs/devtools/speed/get-started/ Hopefully this helps, Nick