What Shopify merchants get wrong about Core Web Vitals — and what's actually worth fixing

I've been scanning Shopify storefronts for the last few months across a sample of stores I've had access to through an app I shipped. Most of them fail Core Web Vitals on at least one metric, and the pattern is depressingly consistent: it's almost always the same three things, in the same order, and the fixes are usually less work than the merchants think. The number that surprised me most: a large share of the product pages I've scanned have an LCP above 4 seconds on a throttled mobile profile.