Release v1.19.0 (27.06.2019)


  • Ensure Safari does not cache the DOM delay script when navigating backwards
  • Detect and resolve redirect loops in cached pages automatically
  • Ensure credentials are sent for origin requests in Edge 17
  • Ensure service worker timings are not overridden in race conditions
  • Blacklist resources if no client found for request


  • Ensure the Service Worker is updated to new version on first navigation
  • Never cache opaque responses with status code 0
  • Make app name case insensitive


  • Expose backend cache hit flag as SpeedKit.lastNavigate.backendCacheHit
  • Expose the source of the navigate response as SpeedKit.lastNavigate.source
  • Expose the reason for the source of the navigate response as SpeedKit.lastNavigate.cause
  • Enabled request collapsing for responses with query parameter bqpreloadrequest

Release & Docs v1.19.0

Release v1.18.0 (23.05.2019)

Bug Fixes

  • Stale critical resources are not returned to browser without staleness check
  • Query parameter stripping using regexes
  • Check blacklist/whitelist for delayed resource types where delaying is not supported


  • Do not use cookies and client storage on default configuration
  • Do not disable Speed Kit on errors also thrown on origin request (e.g. by ad block extensions)
  • Use navigation preload response as Dynamic Block preload response when navigationPreload is active and HTML not blacklisted


  • Add option delayDOMLoadedEvent to delay DOMContentLoaded event after Dynamic Fetcher is finished
  • Add option for userAgentDetection to configure which kind of resources are varied by device type
  • Add option to set custom split test group in the Speed Kit config
  • Add option to set a splitTestId to sperate different kinds of consecutive split tests
  • Expose SpeedKit.lastNavigate.splitTestId and as split test group and id that were actually used by the Service Worker on navigation
  • Expose SpeedKit.splitTestId and as the intended split test group and id for the next navigation
  • Expose SpeedKit.lastNavigate.fromOrigin as information whether the current HTML file was served from the origin server as opposed to from Speed Kit caches

Release & Docs v1.18.0

Release v1.17.1 (12.04.2019)

Bug Fixes

  • Fix typo in docs for stripQueryParams option
  • Use updated cache revision to switch Service Worker caches when Bloom filter is cleared

Release & Docs v1.17.1

Release v1.17.0 (11.04.2019)


  • Expose A/B test group on SpeedKit global object
  • Send non-permanent redirect to browsers and cache in Service Worker


  • Extend delayed option to also delay resources after dynamic fetcher is finished
  • Add image optimization option to use existing image size query parameters
  • Add enabledSites and page rules to stripQueryParams option to narrow affected sites and resources
  • Improve cookie rule to match both cookie and value

Release & Docs v1.17.0

Release v1.16.3 (28.03.2019)

Bug Fixes

  • Fix tracking in old IE and Safari browsers

Release & Docs v1.16.3

Release v1.16.2 (25.03.2019)

Bug Fixes

  • Improve browser detection to cover Chrome on all Samsung devices

Release & Docs v1.16.2

Release v1.16.1 (20.03.2019)

Bug Fixes

  • Do not delay tracking request when already painted

Release & Docs v1.16.1

Release v1.16.0 (19.03.2019)

Bug Fixes

  • Ensure only one tracking request is sent
  • Fix race condition in critical resource preloading to ensure requests are only sent once


  • Race Dynamic Block request and Speed Kit request to improve cache miss performance
  • Wait for paint before sending tracking


  • Add support for Instant Refresh Jobs by bypassing the cache for not refreshed resources
  • Add custom event tracking function SpeedKit.track to track user behavior on the site
  • Add sessionId and CDN cache metrics (cdnPoP, cdnCacheHit, cdnBackendTime) to tracking
  • Track page impressions accelerated by Speed Kit

Release & Docs v1.16.0

Release v1.15.0 (31.01.2019)

Bug Fixes

  • Ensure max length of encoded URLs
  • Fix activation and deactivation of navigation preload option
  • Ensure tracking works in browsers without Service Worker support
  • Fix mobile detection for URLs with hash param (bug in Chrome mobile emulation only)
  • Fix race condition in Speed Kit reconnect in Edge
  • Reestablish IndexedDB connection after database errors


  • Add preloadDynamicBlocks option (default false) which loads dynamic blocks parallel to navigate request to ensure blocks are replaced as early as possible
  • Add sdnSetup option (default false) to ensure correct interaction with SDN when Speed Kit is disabled
  • Handle exceeding cache quota by deleting old resources
  • Add firstPaint and firstContentfulPaint to tracking
  • Add userId, firstLoad indicator and userAgent to tracking
  • Add split option (default 1.0, i.e. is off) for A/B testing
  • Add blocks option to Dynamic Fetcher for easier dynamic block definitions
  • Make Dynamic Fetcher run in all browser without Service Worker support (needed for SDN)

Release & Docs v1.15.0

Release v1.14.2 (2018-11-29)

Bug Fixes

  • Dispatch Speed Kit loaded event on window instead of document

Release & Docs v1.14.2

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