Performance 2025 chapter#4334
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tunetheweb merged 101 commits intoHTTPArchive:mainfrom Jan 16, 2026
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Add figure markup for Core Web Vitals data visualization.
Updated the sheets_gid for the good CLS chart and added a new figure markup for the monthly trend of websites with good CLS by device.
Added figure markup for unload handler usage statistics in 2025.
Added a conclusion section summarizing visual stability improvements and areas for further optimization.
Refine the discussion on CWV data, emphasizing loading performance, interactivity, and visual stability. Add sections for Loading Speed, Early Hints, Speculation Rules, and Conclusion as TODOs.
Added sections for Images and Animation with TODO notes.
Expanded the 'Loading Speed' section to include detailed metrics on First Contentful Paint (FCP) and Time to First Byte (TTFB), along with performance improvements for 2024 and 2025.
Updated authors, reviewers, and analysts for the Performance chapter. Added a section on data sources and revised content for clarity and completeness.
tunetheweb
reviewed
Jan 12, 2026
Updated analysis of Core Web Vitals performance across mobile and desktop sites, highlighting the U-shaped pattern in site popularity and performance investment.
Updated the chart URL for the Core Web Vitals performance data.
Updated links to Early Hints and Speculation Rules for clarity.
Updated performance metrics for Core Web Vitals, detailing improvements in mobile and desktop performance from 2023 to 2025. Added insights on loading speed, interactivity, and visual stability, along with the impact of cached resources on secondary page navigations.
Added insights on TTFB and FCP improvements from 2024 to 2025, highlighting the impact of server response times and render-blocking resources on performance metrics.
Revised language to enhance clarity and precision regarding web performance challenges and advancements.
Corrected wording for clarity regarding the impact on mobile devices.
Reorganized the explanation of Largest Contentful Paint (LCP) for clarity and improved flow. Separated statistics and definitions for better readability.
Updated performance metrics and insights for Core Web Vitals, including changes in image formats and loading strategies. Improved clarity on LCP image hosting and lazy loading practices.
Reorganized content for clarity and updated statistics on image format usage.
Summarized key trends in loading metrics, emphasizing improvements in FCP and LCP, limited adoption of new image formats, and the impact of lazy loading on load times.
tunetheweb
reviewed
Jan 15, 2026
tunetheweb
approved these changes
Jan 16, 2026
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Closes #4082
Staged version: https://performance-2025-dot-webalmanac.uk.r.appspot.com/en/2025/performance
Staged featured quotes: https://performance-2025-dot-webalmanac.uk.r.appspot.com/en/2025/?feat=performance#featured-chapter
This is the first draft and expect review/edits
Known pending items below