The Play JSON controller is using Futures to do JSON serialization. https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/play-java/app/controllers/Ap

The Play JSON controller is using Futures to do JSON serialization. https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/play-java/app/controllers/Application.java https://github.com/TechEmpower/FrameworkBenchmarks/blob/mast... Compare this to the Java Servlet, which just serializes directly in the Servlet callback. https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/servlet/src/main/java/hello/JsonServlet.java https://github.com/TechEmpower/FrameworkBenchmarks/blob/mast... The former seems like overkill.