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perf(button, theming): remove quadratic costs from the first render - #2598
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- Read ElementInternals.labels only when a label can name the host (an id or an ancestor <label>). Each read creates a live list that the browser updates on every DOM change, so N form controls cost O(N²). The SSR DOM shim has no closest(), so the server skips it. - Keep the global theme listeners in a Set, not an EventTarget, which scans all listeners on each add and remove. - Chat: drop the unused ids of the message action buttons. 5,000 list items with a button: Chromium 31.4 s -> 0.8 s, Firefox 12.4 s -> 2.4 s, WebKit 5.3 s -> 1.9 s.
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Description
5,000 list items with a button: Chromium 31.4 s -> 0.8 s, Firefox 12.4 s -> 2.4 s, WebKit 5.3 s -> 1.9 s.
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Checklist