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Yesterday I learned that template contents are stored in other documents, so adding them or a direct clone of them needs a full tree walk to "adopt" them whereas importNode does the adoption at the time of cloning. It is an easy win for a modest performance improvement.
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Yesterday I learned that template contents are stored in other documents, so adding them or a direct clone of them needs a full tree walk to "adopt" them whereas importNode does the adoption at the time of cloning. It is an easy win for a modest performance improvement.