How I get marketing sites to 100/100 on mobile Lighthouse (the exact Astro setup) (opens in new tab)

Open zivaro.co.za in PageSpeed Insights on the mobile profile. Performance 100, Total Blocking Time 0ms, and that is on the Moto G Power, Slow 4G profile, which is about as unkind as the test gets. The four demo sites in my work gallery sit around 99 on the same profile. I am not posting that to brag. I am posting it because a perfect mobile score is not hard, it is just unfashionable. Most agency marketing sites score in the 50s to 70s on mobile, and the reason is almost never the thing peop...