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Re:Kotlin's hidden costs – Benchmarks by BurningFrog on Tuesday July 04, 2017 @10:09PM (#14699575)
5-10% is 3-6 months of Moore's Law.
Re:Kotlin's hidden costs – Benchmarks by nine_k on Wednesday July 05, 2017 @01:06AM (#14700072)
If it still held. "The free lunch is over" [1], and has been for years now.

[1]:http://www.gotw.ca/publications/concurrency-ddj.htm