Changelog

Author: OEvgeny

CHANGELOG.md

@@ -340,7 +340,8 @@ Breaking changes in this release:
 - Improved adaptive cards rendering in copilot variant, in PR [#5682](https://github.com/microsoft/BotFramework-WebChat/pull/5682), by [@OEvgeny](https://github.com/OEvgeny)
 - Bumped to [`botframework-directlinejs@0.15.8`](https://www.npmjs.com/package/botframework-directlinejs/v/0.15.8) to include support for the new `streaming` property, by [@pranavjoshi001](https://github.com/pranavjoshi001), in PR [#5686](https://github.com/microsoft/BotFramework-WebChat/pull/5686)
 - Removed unused deps `simple-git`, by [@compulim](https://github.com/compulim), in PR [#5786](https://github.com/microsoft/BotFramework-WebChat/pull/5786)
-- Improved `ActivityKeyerComposer` performance for append scenarios by adding an incremental fast path that only processes newly-appended activities, in PR [#5790](https://github.com/microsoft/BotFramework-WebChat/pull/5790), by [@OEvgeny](https://github.com/OEvgeny)
+- Improved `ActivityKeyerComposer` performance for append scenarios by adding an incremental fast path that only processes newly-appended activities, in PR [#5790](https://github.com/microsoft/BotFramework-WebChat/pull/5790), in PR [#5797](https://github.com/microsoft/BotFramework-WebChat/pull/5797), by [@OEvgeny](https://github.com/OEvgeny)
+   - Added frozen window optimization to limit reference comparisons to the last 1,000 activities with deferred verification of the frozen portion, in PR [#5797](https://github.com/microsoft/BotFramework-WebChat/pull/5797), by [@OEvgeny](https://github.com/OEvgeny)
 
 ### Deprecated