Re: [whatwg/dom] prepend/append are inefficient compared to doing it yourself (#433)

@ArkadiuszMichalski @annevk For what it's worth `.after` seemed to be more performant than `.append`. Or perhaps using (yet another) `DocumentFragment` as an intermediary when collecting template iterations was far superior to using `DocumentFragment` in `template.contents`. Seemed fishy to me like although a fragment was still connected to `Document` somehow based on slowness.

Our operation is to have `.bind`able templates that when given a collection yield the template to the current object iteration and finally appending result of template mapping immediately `.after` template. 

```html
<ul>
  <template name=item>
    <li>Hello {name}!</li>
  </template>
</ul>

<script nomodule src=//unpkg.com/snuggsi></script>
<script nomodule>

// when context is a collection
const
  template = Template `item`
, context  = [ {name: 'DevPunk'}, {name: 'Snuggsi'} ]

template
   // internal template render for each item in context
  .bind (context)
/*
<ul>
    <template name=item>
    <li>Hello {name}!</li>
  </template>
  <li>Hello DevPunk!</li>
  <li>Hello Snuggsi!</li>
</ul>
*/

</script>
```

May not be relevant but definitely in the same ballpark. I know @annevk is adamant about seeing real world use cases. And I agree.

https://github.com/devpunks/snuggsi/blob/master/elements/html-template-element.es#L35-L44

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