I was curious about what Svelte "compiler magic" was so this is what I found (I may be wrong): The compiler wires up all the reactive JavaScript ahead of time,

I was curious about what Svelte "compiler magic" was so this is what I found (I may be wrong): The compiler wires up all the reactive JavaScript ahead of time, while Angular and React do it at run time. Svelte also does DOM manipulation directly and is fast because browsers have improved very much since React was first created. One of Svelte's taglines was "You don't need a virtual DOM". That said, I haven't used Svelte to see what kind of JavaScript it makes and how easy it is to reason about once compiled.