Compression, HTTP/3 and hints checker
Whether the server delivers gzip, Brotli and Zstandard and how much it saves, the HTTP version, whether it advertises HTTP/3, Early Hints (103) candidates and preload and preconnect mistakes.
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How to improve LCP: the four parts of LCP time
LCP breaks down into TTFB, resource load delay, load duration and render delay. How to measure each part and what to fix in each one.
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