[w3c/webcomponents] [templates] Ensure that template instantiation actually improves the platform (#704)

Before adding anything as complicated as https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Template-Instantiation.md it is better to ensure it improves the platform.
I'm especially interested in the performance aspect.

If a polyfill could implement the proposal without being significantly slower, would there be need to add the API natively?

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