What I mean by the question title is for example, let's say I have a really busy homepage and I use tons of CSS to do things like uppercase and lowercase and capitalize SEVERAL blocks of text when those are things that can be done manually with text. And I do it a ton of times on the page. Would that reduce page load performance over simply writing the blocks of text how I want them to appear without using CSS on those blocks of text?
EDIT: Found what I was looking for here: Is CSS text-transform "expensive" thanks to @BenY.