Tagged the passage bucket: per-tile prepareSweptTubeBase dominates (0.47-0.92 s summed per view), smooth-min second. Segment lower-bound pruning (-17% pairs) and deferred fallback floor work stayed hash-exact but moved near-ready <3%. Still +17..+26% vs L109. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1