Performance Voice in Your Head
summary
Chrome DevTools and WebPageTest reveal a large background IMG uses a data-src attribute so JavaScript controls when it appears, and the image finishes downloading at ~2s but doesn't render until ~4.5s while the CPU is maxed by JS in the DevTools timeline. Temporarily blocked three scripts (jQuery/libs/core/header) and the start‑render shifts ~2.5 seconds earlier — a clear, testable optimization with measurable RUM follow‑up.
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