title: Make WordPress WP-API faster by not loading theme and plugins
body: <p>I would like to make requests to the WordPress API much faster. My API is implemented in a plugin (using register_rest_route to register my routes). However, since this is a plugin, everything is loaded with it (the child-theme and the theme) and basically a query to this API is taking half a second because of all this useless parts loaded.</p>
  
  <p>Doesn't WordPress API can be used in another way? Since most plugin making use of the WP-API doesn't need any other plugins to be loaded, even less a theme... I don't understand how they could miss that.</p>
  
  <p>Is there anyway to do this?</p>