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We have tried to compile an extensive list of “slow” plugins, which you should try to stay away from. We did test most of these our self, some of these we found online, and some of these got reported to us by our clients.  If you see a plugin that you recognize that you currently use, we strongly suggest that you find an alternative. Always research the plugin before you install it, read any reviews especially concerning Performance. In general plugins which make a lot of external calls to 3rd party websites or services such as Feeds, Translation plugins, Social media integrations, etc - will slow your WP significantly.  Please, note the JetPack plugin in the list - we see a lot of people trying to use this to speed up their website, this is not a good plugin and should not be used for any WP! Please, note that is not always about the number of plugins you use in your WP, but what kind of plugin you use! This list is being updated periodically: AdSense Click Fraud Monitoring Better WordPress Google XML Sitemaps Broken link checker Constant Contact for WordPress Contact Form 7 Contextual Related Posts Digi Auto Links Disqus Comment System Essential Grid Fuzzy SEO Booster Google XML Sitemaps Jetpack - DISABLE THIS! NextGEN Gallery NewStatPress Reveal IDs Revolution Slider S2 member SEO Auto Links & Related Posts Similar Posts Slimstat Analytics SumoMe VaultPress Visual Composer WordPress Facebook WordPress Related Posts WordPress Popular Posts WP Statistics WP-PostViews WP Power Stats wpCloaker WPML Yet Another Related Post Plugin Yuzo Related Posts