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The sampler re-folded every group, both groupings, under the collector lock on each 300 ms progress publish, and still computed per-tag counts, tag lengths and content-format shares that the screen no longer shows. - KindVariant loses formats and tags (and TagUsage goes); the content format still keys the shape grouping - each group caches its KindVariant until it gains an event, so a publish sorts the cached snapshots and unchanged cards keep the same instance - measured on the JVM, 5,000 events in ~4,900 shapes: a publish went from 15-17 ms to ~0.5 ms, adding the events from 84-97 ms to ~70 ms Fixes a race: cancelling or re-running did not stop a publish already in flight, so its late write could put a stopped lookup back in the running state (stop icon and progress bar stuck) or show the previous run's counts under a re-run. Each run now holds a token and only the current run may write the state. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J8YCZ4LiTaQX3PUoAitfcN