Reopened chats keep each answer's response time
Response times now survive a reload, so every finished answer in a chat still shows how long it took.
You watch an answer finish and see how long it took beside it. Reopen that chat the next day and the timing was gone from every answer except the ones generated in that visit.
Response times after a reload
Each completed answer now shows the same elapsed time it showed while it was being written, whether you generated it a minute ago or last month. Open an old chat and scan back through it to see which questions took the longest.
Branch order while an answer is still writing
When you reload a chat mid-answer, the turn still being generated used to risk sorting as the oldest branch. Chief now places it last among its siblings, so the branch counter and the answer you land on match the one in progress.
Nothing to turn on. Reopen any chat and the timings are there.