It should be noted that one must assume a performance penalty when calling stream() on a Collection, as doing so creates a new Stream object. Within inner loops

It should be noted that one must assume a performance penalty when calling stream() on a Collection, as doing so creates a new Stream object. Within inner loops and for small Collections I recommend avoiding stream() altogether if performance is a concern. Furthermore, while tempting, Stream.parallel() should only be called when it is certain that the additional cost of a ForkJoinPool instance creation can be amortized over the duration of the lambda's runtime. With that said, I welcome Streams and other FP concepts to Java.