Parallel Streams

• https://stackabuse.com/java-8-streams-guide-to-parallel-streaming-with-parallel/

• https://www.baeldung.com/java-when-to-use-parallel-stream

• https://stackoverflow.com/questions/52419522/whats-the-best-way-to-parallelize-a-rest-call

• https://www.baeldung.com/java-8-parallel-streams-custom-threadpool

• https://dzone.com/articles/think-twice-using-java-8

• https://roytuts.com/difference-between-parallel-stream-and-completablefuture-in-java/