No, they use Play's JSON lib. It's kind of a moot point because Play's lib is in fact a wrapper for Jackson. Here's the source: https://github.com/TechEmpower/

No, they use Play's JSON lib. It's kind of a moot point because Play's lib is in fact a wrapper for Jackson. Here's the source: https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/play-java/app/controllers/Application.java https://github.com/TechEmpower/FrameworkBenchmarks/blob/mast... So the question stands: If Play & Netty are using the same JSON serialization code, why is Play seven times slower?