A session is not its piece. The rock and its prox address used to take the piece's name the moment one was published (bunido became butterfly) and again on every swap. Now a rock keeps the name it was born with and prox:aesel:<name> keeps pointing at the same session; the piece is named on its card and in its address. /preview notepat, /preview @handle/slug, /preview $cow or a URL puts any piece on the rock and its card without making it the session's piece. The session keeps writing its own underneath; bare /preview hands the card back to it. ac check launches puppeteer's headless shell instead of a fresh full Chrome profile and kills the browser rather than waiting on close. Back to back under the same load: 70-78s before, 16-20s after, same findings. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>