The fundamental differences are quite stark. Vue, Svelte, web components, and vanilla only execute code that is marked as a callback. Example: let x = 0

The fundamental differences are quite stark. Vue, Svelte, web components, and vanilla only execute code that is marked as a callback. Example: let x = 0 var counter = computed(() => ... ) In this Vue snippet of an SFC, the callback in the computed executes in reaction to some change without invoking the assignment of x (obviously a trivial case here). DOM + JavaScript is the same React invokes the entire component function and all calls and allocations in the path of the component function. The mental model is inverted in a sense. This is one of the reasons React generally performs more poorly in both speed and space.