Unused CSS
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Is there any advantage to removing unused CSS on a wp theme template. If removed will it not merely be added with the next update?
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There is a marginal advantage to smaller CSS files, in terms of page speed. I believe that Google's PageSpeed and Yahoo!'s ySlow both recommend that you're using a 'minify' tool on both your CSS and JavaScript in fact. But again, the improvement is more often than not extremely minimal compared to other performance enhancements like Varnish.
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WordPress updates the default theme only when you do an upgrade. So if the CSS file is attached to the default theme, yes. Otherwise, no.
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