This plugin creates the image files required by the Retina (or any high-DPI) devices and displays them to your visitors accordingly. Your website will look beautiful and sharp on every device. The retina images will be generated for you automatically (you can also do it manually) and served to the visitors. You will be able to control everything from a nice dashboard.
From WordPress 4.4, responsive images support has been added to the core. The plugin never supported responsive images (only retina) so this is a good news. The plugin supports this new WordPress already and adds the retina images to the src-set. It also give you options to control what WP 4.4 is doing (and to also remove that new image size which was added and might be redundant).
I originally made WP Retina 2x for my own use and, of course, I use it on my two main websites. Do you want to see what it does and how my websites appear on Retina? Visit them at:
I recommend both WP Engine and SiteGround, they are both really nice hosting services for WordPress with fast and serious support. If they are too expensive for you, then I recommend HostGator. They do not offer the best performance but are inexpensive and have surprisingly good support.
WP Retina 2x doesn’t optimize your images. But if you are interested in optimizing your images, I have a page about Image Optimization plugins here: Image Optimization for WordPress.