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Opening a large channel member sheet mounted and laid out every person in a grouped column. A captured Debug simulator entrance spent 242 ms in the UI callback, including 223 ms in layout. Build each person and agent as a lazy sliver row while preserving the grouped cards, names, statuses, management menus, and activity actions. Screen-reader row indices continue across both groups. A separate formatting-only commit fixes an existing carousel-test formatter discrepancy. No duplicate member-sheet performance PR or issue found. ### Validation - Added a 200-member widget regression: the original mounts 100 people initially; the fix mounts fewer than 20 nearby rows and reaches the final person and agent. - Added grouping, compact sizing, empty state, member tap identity, accessible indices, and scrolled member/agent menu checks. Existing channel-details “See all” navigation test passes. - Mobile formatting, static analysis, and the full mobile test suite passed on the committed tree. - Synthetic before/after rendering is pixel-identical at the same viewport. - Populated native iOS 26.5 simulator workflow: open members, scroll through people and agents to the end, then close. Final installed build passed this workflow. Debug, accessibility automation, profiler overhead, different Flutter versions, and shared-host load limit timing conclusions. This removes eager offscreen layout; it does not establish a controlled end-to-end speedup or release-device performance. ### Visual check Synthetic member sheet; before and after are pixel-identical at this viewport.  --------- Signed-off-by: Tom Brow <tomb@block.xyz>
