Is there any trick to speedup the load time of a js chunk file generated via create-react-app?

I have a small react app built with cra that run pretty well in development. After yarn run build, 3 js files are generated and one of them has 1,79MB size. Once uploaded to the server, this little file take over 40s-1min to load, I don't understand why. The size is pretty light, right ? If anyone know how I Can figure it out. Thanks.