Re: [w3c/webcomponents] Template/part proposals should explain how and why they improve performance (#901)

@smaug---- I think you are right. Optimizing the JS -> binding layer-> native doesn't seem like it would result in a big win. 
However, there are still areas for optimizing that can result in big wins. This includes minimizing the effect of attributes and properties that can cause reflow. Ex: class, style, classlist, etc.   The batch commit can prevent reflow until all DOM mutations have been completed. 

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