Put yourself in CR's shoes. You can't do every test of every laptop using the popular sites, because content payloads on various sites change over time. You wo

Put yourself in CR's shoes. You can't do every test of every laptop using the popular sites, because content payloads on various sites change over time. You won't get apples to apples comparison tests. The easiest way to do a repeatable browser test is to turn caching off on the browsers and hit a few web pages that never change and that you control on your own server. By repeating that test over and over again, it simulates hitting new sites even though you're hitting the same pages. If I was in the business of doing laptop reviews, that's how I'd do it. -- edit: This blog entry by Marco Arment on the topic is worth reading: https://marco.org/2017/01/10/cr-mbp-battery-update https://marco.org/2017/01/10/cr-mbp-battery-update