For another look at benchmarking parallel streams, see “ From Imperative Programming to Fork/Join to Parallel Streams in Java 8 ” by Raoul-Gabriel Urma and Mario Fusco (InfoQ, February 2014).

For example, the Streams API focuses on parallel processing of large data sets, and Project Nashorn’s faster JavaScript engine is all about performance in server workloads.

A preview feature in Java is one that is not yet added permanently even though its design, specification, and implementation are complete. Presently Java has quite a few preview features in the ...