Hi @VitthalaShiva ,
For better performance, minification of clientlib is better option to do. Am not sure why you are not willing to update the config. But I would suggest you to enable minification in osgi itself.
If you still need to individually do minification of clientlib without osgi option, you need to use third party tools to minify the clientlib and add it in codebase or custom code to achieve the same.
I would suggest you to enable the config in osgi which pretty straightforward and good option to go ahead.