Sometimes a LinkedIn post of mine is leading to new questions as well. This time: "How do you get a high PageSpeed score when a site is using HTTP/2?"
Last Thursday, January 16th, I joined TJ Gamble's livestream to answer some PageSpeed related questions. Critical CSS was one of the subjects. Just before the livestream, I published a code snippet to auto-enable CSS critical Path within Magento 1.
A better perceived performance and thus user experience, will result in higher conversion and thus revenue.
Before helping an e-commerce company with improving their pagespeed, sometimes I create a proof of concept first. By doing this, stakeholders will get a better grasp of what can be achieved in real life.