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Re:Java 8: New features in ConcurrentHashMap by rallycarre on Wednesday January 18, 2017 @12:52PM (#13428466)
And the compile time is comparable to Java's. One of the most import thing imo.
Re:Java 8: New features in ConcurrentHashMap by premium-concern on Wednesday January 18, 2017 @05:46PM (#13431139)
Someone measured it and and it is fact it's substantially slower than Scala: https://twitter.com/kmizu/status/817570546179194881

Kotlin marketing != reality, it seems.