OpenJDK has changed the default from 9 to 15 in JDK 14: https://bugs.openjdk.java.net/browse/JDK-8234863 https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2019-December/036332.html Scala applications tend to see the biggest benefit (one of the Scala benchmarks improved by 3x). Reviewers: Rajini Sivaram <rajinisivaram@googlemail.com>