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Deactivate all unwanted plugins
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Latest Version of WordPress and All Plugins
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Use PHP 7
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Block Bad Bots and Crawlers eating your server resources
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Reduce the size of the images
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WordPress Caching
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Always Use CDN for uploading video and Audio files
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Optimise database queries from your theme
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Disable Hot Linking
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HTTPS for all pages
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Use a Web Application Firewall at DNS Level
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Reduce Post Revisions