Make WordPress API faster by not loading theme and plugins

I would like to make requests to the WordPress API much faster. Right now, it is loading all the plugins, the child-theme and the theme and basically a query is taking half a second. Impossible to optimize this, the request doesn't do anything, it just returns a simple string as soon as it's called. Of course I could disable the plugins and the themes completely but the website requires them ;) Of course, the API part of the website doesn't require any of it, just an access to the database, basically the WordPress core. Is there anyway to do this?

via Chebli Mohamed