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How do http3 and quic protocols affect core-web-vitals metrics?

Asked on Sep 22, 2025

Answer

HTTP/3 and QUIC protocols can significantly enhance Core Web Vitals by reducing latency and improving connection reliability, which directly benefits metrics like LCP and FID. These protocols use multiplexed connections and improved congestion control to deliver faster and more efficient data transfer.

Example Concept: HTTP/3, built on the QUIC protocol, reduces latency by establishing faster connections and minimizing the handshake time compared to HTTP/2. This leads to quicker data transfer and improved page load times, positively impacting metrics like Largest Contentful Paint (LCP) and First Input Delay (FID) by providing a smoother and more responsive user experience.

Additional Comment:

HTTP/3 uses UDP instead of TCP, which helps in reducing connection setup time.
QUIC's multiplexing prevents head-of-line blocking, enhancing data flow efficiency.
Adopting HTTP/3 can lead to more stable connections, especially on mobile networks.
Ensure your server and CDN support HTTP/3 to leverage these benefits.

✅ Answered with Core Web Vitals best practices.

Ask any question about Performance here... and get an instant response.

How do http3 and quic protocols affect core-web-vitals metrics?

Asked on Sep 22, 2025

Answer

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