The author seems to think that java 8 lambdas are faster than scala lambdas. This isn't strictly true. Java 8 spins the inner classes for lambdas at first use,

The author seems to think that java 8 lambdas are faster than scala lambdas. This isn't strictly true. Java 8 spins the inner classes for lambdas at first use, this gives them a performance boost at startup (loading tons of tiny classes from a jar is painfull for the jvm) but at runtime they perform the same (it's just invokevirtual). Another optimization that java 8 has is that lambdas that don't capture are cached & reused, scala does the same if you use the -optimize flag.