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Recently I’ve come upon a mobile UI kit which used very long CSS class names, seemingly instead of utilizing multiple class names and CSS inheritance (e.g. ".container-element-subelement"). Is there much performance gain from this? Because it sounds like a nightmare to have to maintain those stylesheets later.
Performance gain from what you referred to should be negligible (of course, depends on the user’s hardware, the page size, and browser).
There was some discussion on this here: CSS child selector performance vs. class bloat