I&#x27;m not talking about execution performance - I&#x27;m talking faster to develop for. It might be faster to get &quot;hello world&quot; running in JS but once you have a few people working on a project and need to do nontrivial stuff not provided by &quot;JS framework X&quot; (in this case React) you&#x27;ll see the value of having sane language semantics, static typing, tools and a mature ecosystem (much higher quality than JS).