InfoQ article on Groovy JSON and Boon.

"Groovy 2.3 will ship with one of the fastest JSON parsers on the JVM, according to Rick Hightower, the ubiquitous consultant and author. In his article on JSON serialization benchmarks, Hightower claims that Groovy's JSON support and the Boon JSON parser are up to 3 to 5 times faster than the current Jackson parser at parsing JSON from String and char arrays, and 2 to 4 times faster at parsing byte arrays."

http://www.infoq.com/news/2014/04/groovy-2.3-json