Polymer has generally been as fast or faster than Angular and React. We've seen that pretty consistently in Todo MVC, Hacker News, etc., shootouts. But Polymer

Polymer has generally been as fast or faster than Angular and React. We've seen that pretty consistently in Todo MVC, Hacker News, etc., shootouts. But Polymer isn't our current generation library anymore. LitElement, which is based on the lit-html template library, is. LitElement measures clearly faster than Angular and React on shootouts. There's nothing inherently inefficient about web components, and we do batching of DOM updates much like frameworks. LitElement is even able to yield between different component renders naturally, like React concurrent mode, to not jank the page.