Make your website look beautiful and smooth on Retina (high-DPI) displays such as the MacBook Pro Retina and the iPad.
The plugin is easy to use in client-side mode.
Regarding server-side mode: The iPad web browser forgets the WP Retina cookie every time I power off the device. As a result, it loads the standard images only during the first page hit, and then HiDPI images on subsequent hits. So, the server-side method is quick but not reliable.
Plugin doesn't work with images smaller than 600px.