Optimizing LCP: Reducing TTFB, Resource Load Delay, Load Duration and Render Delay One by One
To lower LCP, split it into TTFB, resource load delay, load duration and render delay and look at each one; if the image cannot be discovered in the HTML, fetchpriority alone does not help. On Bookstore's home page we measure that NgOptimizedImage priority gains nothing with client-side rendering while prerendering cuts load delay from 1.1 s to 27 ms, and we show the SSR pitfalls (document, transfer cache, UseDefaultFiles).
15 Nov 2026
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13 min
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8
