All modern web browsers are based on web standards and they are improving their performance every day. Lightning Web Component also follows W3C web component standards to take advantage of modern technologies and native browser’s feature to execute it as fast with the use of minimally network bandwidth.
Remember, as per current Salesforce release (Spring’19), we have to develop Lightning web Component outside of the Salesforce Environment.
Lightning Web Component and Lightning Aura Component can co-exist together in your application. However, you can easily migrate to the Lightning Web Component Model from Lightning Aura Component Model.
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