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ShortPixel Critical CSS

Jetpack Boost – Website Speed, Performance and Critical CSS

PageSpeed Ninja – Cache, Minify, Defer CSS JavaScript, Critical CSS, Optimize Images, Convert WebP

Reduce Unused CSS Solution with Critical CSS For WP

RapidLoad 2.2 – Speed Monster in One Plugin

WP Critical CSS

Eliminate Render Blocking CSS

CSS Optimizer – Remove Unused CSS

Critical CSS and Javascript