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Seven-day audit of WordPress news site reveals cache queue, hidden image as real CWV culprits

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A developer spent seven days measuring Core Web Vitals on a shared-hosting WordPress news portal in Guarapari, Brazil, between September 6–14, 2026. The site was failing Google's mobile CWV threshold, with its Largest Contentful Paint clocking 2.8 seconds against a 2.5-second limit, blocking eligibility for Google Discover traffic. Three root causes were identified that did not appear in Google's standard diagnostics: a cache plugin's pre-load queue was consuming server resources around the clock, an archive of older articles — not the homepage — was determining field scores because each new publication flushed the entire site cache, and a CSS-hidden featured image was silently downloading 24 KB at high priority while competing with the visible photo. PageSpeed Insights flagged two images for missing size attributes, but controlled browser testing showed both cases were false positives, as layout space was already reserved via width and height attributes.

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