Disable Complete WP Updates

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This plugin completely disables the theme, plugin and core update checking system in WordPress. The plugin prevents WordPress from checking for updates including cronjobs, and prevents any notifications from being displayed. It’s very important that you keep your WordPress theme, core and plugins up to date. If you don’t, your blog or website could be susceptible to security vulnerabilities or performance issues. If you use this plugin, make sure you keep yourself up to date with new releases of your active WordPress version, plugins and themes and update them as new versions are released (simply by deactivating this plugin for a short time).