Is React That Fast as I Expect?

[kokocan12]

Intro

This is my personal point of view.
Do not accept without doubts.

React and Declarative Programming

React draws the contents instead of me.
It means that we don’t need to modify DOM directly.
We just set the states, react draws the contents according to the states.
It is called as declarative programming.

Developer Knows What to Change

React requires additional computation to know which elements change at next state.
It’s called as Reconciliation.
In this process, react travels every sub nodes to detect which nodes need update.
But, in the normal app, developer knows which elements should change.
It does not require any calculation for finding which nodes need update.

Conclusion

React gives us some great declarative programming experiences.
It helps developer not to miss DOM updates.
But It needs more resource for that.

DOM modified by dev > DOM modified by React > DOM rewrited by dev.