Frontend performance is the key component for running a user friendly site. And impacts 80% off the total. We created a new measure component which reports all browser performance metrics on the fly for Chrome and Firefox. But also the diff between desktop and mobile. And don't forget all the different connection type like 3G, 4G, Cable....etc.
Beside the metrics we share a inside overview of all detailed coach rules how to optimize your Magento side. This new tool will be released during imagine.