Babylon.js comes with different versions that you can find in the /dist folder of the repository:
Babylon.js files can be found on our CDN:
Unminified version: babylon.max.js
This version is aimed to be used for debugging purpose only. It is not minified so you can easy use it to debug. Please do not use it in production environment as the file size is really important (more than 3.0 MB).
Minified version: babylon.js
This is the complete version of babylon.js. File size is less than 250KB when gizipped. This version is aimed for production.