generated: '2026-08-13'
method: searched
source: https://developers.google.com/speed/docs/insights/release_notes
url: https://developers.google.com/speed/docs/insights/release_notes
page_last_updated: '2025-10-27'
scheme: dated-narrative
current_version: v5
note: >-
  Google's PageSpeed Insights release notes are a narrative page, not a per-release
  dated log. The most recent explicitly dated entry on the page is January 31, 2019;
  everything after that is summarised without dates (Lighthouse major-version bumps,
  the INP transition, new categories and field metrics, the 120-second timeout raise,
  HTTP/2 support). The page itself carries a "Last updated 2025-10-27" stamp. Entries
  below are recorded exactly as published — undated items carry date: null rather than
  an invented date.
entries:
  - version: null
    date: null
    breaking: true
    highlights:
      - Lighthouse updated to 10.0, 11.0 and 12.0 — each introducing API breaking changes.
      - INP became a pending Core Web Vital, replacing EXPERIMENTAL_INTERACTION_TO_NEXT_PAINT.
      - New categories introduced — Accessibility, Best Practices, SEO.
      - New field metrics introduced — INP and TTFB.
      - Maximum timeout for API requests raised to 120 seconds.
      - HTTP/2 support added.
      - CPU throttling changed to improve mobile lab TBT scores.
      - Shareable link feature added to the UI.
    note: >-
      Published as an undated summary block on the release-notes page. Ordering within
      the block is Google's, not inferred.
  - version: Lighthouse 4.1
    date: '2019-01-31'
    breaking: false
    highlights:
      - Lighthouse, which powers PageSpeed Insights, released v4.1.
  - version: v5
    date: '2018-11'
    breaking: true
    highlights:
      - v5 of the PageSpeed Insights API released.
      - Analysis engine switched to Lighthouse; Chrome User Experience Report field data added.
      - All Lighthouse audits exposed through the API.
      - Previous versions announced as deprecated within six months.
  - version: v4
    date: '2018-01'
    breaking: true
    highlights:
      - Added a speed score based on the Chrome User Experience Report.
      - Refined the original PSI score into an optimization score.
  - version: v2
    date: '2015-01'
    breaking: true
    highlights:
      - Added support for rule groups such as SPEED and USABILITY.
      - Result category added 2017-05-12; render engine switched from WebKit to Blink 2017-02-02.
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com