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I have been using free plugins to defer javascript and to merge CSS. Most of them broke my site so I removed them. I am now using WP Optimize free version and it shows up in Google pagespeed insights as a hindrance to loading the main thread. I am wondering if I should go for wp rocket! And if not WP Rocket, then what? My mobile score is between 70 and 75. It keeps changing for different pages. Please suggest. Thank you.
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