I should also note that my change to virtual-dom is very narrow. It targets prepends specifically and falls back on the original algorithm in all other cases. And that original algorithm is still imperfect if you look at the problem generally (it’s not hard to come up with examples, when it would touch old elements unnecessarily). On the other hand it handles appends, removes, single inserts just fine. And with this you need to get real fancy with the post stream to break out. So practically speaking solving the problem generally might be a bit of an overkill, though of course you can sleep better when you do.