This:

    element.append([array of Elements]);

is in magnitude of times faster than

    for(const el of [array of Elements])
      element.appendChild(el);

so yes, it helps to improve situation.

But think about updates like this:

   element.patch(<p multiple={n > 1}>There {n > 1? "are": "is"} {n} bottle{n > 1? "s": ""} of beer on the wall</p>);

Here you need to update (or not) as the attribute as text nodes. You need some transactional mutation mechanism.