>Since when FP is high performance and better concurrency support? FP is a huge step forward for concurrent development. The availability of immutable and (esp

>Since when FP is high performance and better concurrency support? FP is a huge step forward for concurrent development. The availability of immutable and (especially) persistent data structures is a key point in getting a concurrent application to work well. One of the core points behind FP is to reduce (or even remove) side effects in software development. Those side effects are what make concurrent development hell and unmaintainable. By logic, using FP makes concurrent development easier to handle. As for performance, it's not that obvious whether or not FP is better or worse than other paradigms. Had you asked me ten years ago then the answer would've been obvious (it'd be worse) but interpreters, compiler development, type systems and all that jazz has improved a lot in the recent years.