Yes that is the question posed, is coffee a performance enhancing drug. Often this is thought of as steroids or worse, something seedy and done pout of public sight for fear of being seen.
The image is also of competition between athletes which has reached the level of who has the best chemist rather their athletic prowess. Yet the humble cup of coffee, it all its many guises may make you run faster, jump higher and so forth. Read this article to see how.