"I worked on this project with the team (I helped define the UX rules), I can say that we as a team dont tell people you must get 100/100, your goals is to get over 80ish. If you get over 90 you are doing incredibly well. We advise that you use this tool and webpagetest.org aiming for a speed index of sub 1000 (sub 2000 a lot better than most sites iirc) I think there are other things you can spend your time on that are more impactful than aiming to increase your score 1 point. I suppose my point is, use a suite of tools and make educated changes based off the advice but small incremental improvements are not always worth it." - Paul Kinlan