Reduce unused CSS

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Hey. When I test my website for sitespeed in gtmetrix and pagespeed insights I get the tip to reduce unused CSS.
However, I have already enabled this option in WProcket: minifiy CSS and remove unused CSS.

Is there something else I have to do? It could save me 0.5 sec according to gtmetrix.

Website is [hungryinthailand.com])

Thanks.

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