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Each issue row's IssueAgentActivityIndicator subscribed to the whole workspace agent-task snapshot via useQuery. Any task change swaps the snapshot array reference, so every observing row re-rendered — on a busy workspace the snapshot changes constantly, turning one task update into a full-list re-render and inflating the tab-switch commit. Narrow each row's subscription to this issue's tasks with a `select` (selectIssueTasks). React Query's structural sharing keeps the selected value referentially stable when the issue's own tasks are unchanged, so a snapshot invalidation now only re-renders the rows whose tasks actually moved. This is slice 1 of MUL-4474 (render de-amplification). Virtualization of list/board/swimlane/inbox and the non-position useSortable mount change are tracked separately — they need interactive drag + DevTools Performance verification that the headless runtime can't provide. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>