wip: enable more diffing

packages/web/README.md

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 Build interactive user experiences directly in the web browser!
 
 Dioxus-web provides a `WebsysRenderer` for the Dioxus Virtual Dom that handles events, progresses components, and updates the actual DOM using web-sys methods.
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+## Web-specific Optimizations
+- Uses string interning of all common node types
+- Optimistically interns short strings
+- Builds trees completely before mounting them