Does CSS class name length affect browser performance?

Question

Example: Gmail.

Of all the DOM elements, ~ 2000 has at least one CSS class, and there are ~ 500 different CSS class names on the page. Gmail uses closing-stylesheets to minimize / remove their CSS class names. Does this step increase browser performance? I am thinking about parsing / evaluating HTML / CSS code, choosing a selector, etc.

Example of a cropped class name: "aBc"
Example of the original class name: "tooblar__button - disabled"

Answer 1

Yes. Less bytes less bytes. However, the chances of it being an important factor are tiny.

Answer 2

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