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updatePreview() was bound directly to the comment textarea's 'input' event with no debounce, re-running the full markdown parser (regex passes for headings, tables, links, footnotes, etc.) on every single keystroke. Wrapped it with the existing lt.debounce() helper (150ms) — the initial preview render on enabling the toggle still happens immediately; only the per-keystroke live updates are debounced. Verified via jsdom with real timers: 10 rapid keystrokes within the debounce window produce exactly one parse call instead of ten. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Lhz7pGMaoTfL5sdYS5XiKv