Free WordPress Imgur CDN plugin automatically synchronizes all your images to your Imgur account so that they are served from faster servers from all over the world. Not only this improves the page load times but also your SEO score.
This plugin allows you to synchronize your entire collection, update older posts with the new Imgur links, and also easily revert back all the changes in case you decide to do so.
Currently it does not work with 3rd-party editors like Visual Composer since they use custom shortcodes. It is in the roadmap though so will be added in the near future.