Comment by bryanrasmussen

I'm pretty sure unreadable class names are a byproduct, but perhaps some people may also consider it a feature, of their particular build process.

so they may very well have semantic tags in their development environment. Of course debugging things becomes more difficult for the developer as well unless there is some sort of lookup table to tell them that class .uv.le in the browser maps to .user.name in their codebase, in which case it only becomes marginally slower for some cases.