Lets say your .js files takes up 5% of your total app size after gzip compression, and minification saves you around 20%. Then you have saved around 1% bandwidth at the cost of obfuscation and more difficult debugging. 
And If it&#x27;s cached, witch all main-steam browsers does, you&#x27;ve saved around 0.01%  at best. So if you pay $10,000 in bandwidth costs each month, that&#x27;s $1 saved :P