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Reactive Programming Advantages/Disadvantages

I keep studying and trying Reactive Style of coding using Reactor and RxJava. I do understand that reactive coding makes better utilization of CPU compared to single threaded execution.

Is there any concrete comparison between reactive programming vs imperative programming in web based applications?

How much is the performance gain, throughput I achieve by using reactive programming over non-reactive programming?

Also what are the advantages and disadvantages of Reactive Programming?

Is there any statistical benchmark?