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depends on the amount of operations / speed / throughput and other parameters.

I would take the language you know best.

• ReactPhp is nice, but you need memory handling since the php model is request-response based (i would look into generators and coroutines) nikic.github.io/2012/12/22/Cooperative-multitaski…
• Node has a really high throughput so it's a solid choice maybe also with generators and async
• Python can be really nice and elegant code and has a more sophisticated threading model but the question is if it's needed / necessary

but you can do it with all of them .... so it's taste to me.