Identify which resources belong on the critical rendering path and which should be deferred.
The browser can do many things, but not all at the same first moment. Keep correctness early Resources that make the first viewport structurally correct belong early: HTML, critical CSS, essential blocking data, and the visible LCP resource. If removing the resource creates a broken first view, it may be critical. Move enhancement later Chat widgets, heatmaps, below-the-fold carousels, optional personalization, and secondary route code are usually enhancements. They may be valuable, but they do not need to block initial rendering. Protect the main thread Even after bytes arrive, JavaScript can delay response and paint. The critical path is not…
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