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. Above 2.5s is "needs improvement." Above 4s is "poor." That means a lot of merchants are paying for Google ads that land on a page Google itself considers slow, and it's costing them in two places at once — quality score and conversion. This article is the long version of what I tell merchants when they ask me what to fix first. None of this is theoretical. I've shipped all of it.…