If anything is unfair it's that they're using long ints. Java (and I assume other JVM languages) have the overhead of allocation for most of the longs. Testing

If anything is unfair it's that they're using long ints. Java (and I assume other JVM languages) have the overhead of allocation for most of the longs. Testing with allocation in all languages will give a better idea of performance (and I won't be surprised if .Net core fares very well).