I am currently developing projects using fullstack, node and react. I build react.js and send the built one, which is index.js under the build folder to the node server, which renders it with res.sendFile module. And I automated building task in every single moment I change react.js using watch module. The problem is, it requires about 6~8 sec every the react server rebuilds the modified react.js files. Is there any solution I can make better performances when changing react files?