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perf(internals): remove the remaining per-instance listener and labels costs - #2599
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…s costs - Async context consumer: one context-provider listener per document and a set of the unanswered consumers, not one listener per host. - Id resolver: the resolvers of a root share one set, not an EventTarget, which scans all listeners on each add and remove. - ARIA projector: resolve the host name in hostUpdate, inside the labels cache of the update, so each update reads the labels once.
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