Svelte

Svelte is a UI compiler: it converts declarative components into highly efficient, vanilla JavaScript, eliminating the Virtual DOM overhead.

Svelte redefines front-end development by operating as a compiler, not a traditional framework or runtime library. Unlike React or Vue, which perform bulk work in the browser (e.g., Virtual DOM diffing), Svelte shifts that load to the build step. This compile-time approach generates highly optimized, surgical code that updates the DOM directly: the result is smaller application bundles, minimal overhead (often just 2KB of runtime code), and superior performance metrics. Developers appreciate the concise component syntax, which uses standard HTML, CSS, and JavaScript, ensuring a faster, more approachable workflow.

https://svelte.dev