The choice of a platform has nothing to do with the response times. The author was referring to a typical "enterprise" app, which might call several backends at

The choice of a platform has nothing to do with the response times. The author was referring to a typical "enterprise" app, which might call several backends at once. Java or no Java, some of them will not be that responsive, and it will increase the overall response time. His point was that the "enterprise" way of thinking of what is "normal" should be reconsidered when you switch to GAE -- Java has nothing to do with it.