How is high performance achieved when using reactive technologies?

High performance in reactive technologies is achieved through the following principles:

• Non-blocking I/O: Input/output operations do not block the thread, allowing efficient resource utilization and handling more requests.

• Event-driven and asynchronous processing: Reactive systems respond to events and process data asynchronously, reducing wait times and increasing throughput.

• Backpressure management: Controlling the data flow prevents system overload by regulating processing speed.

• Limited number of threads: Instead of creating many threads, a limited pool is used, reducing context switch overhead.

Example in Java using Reactor:

Flux.range(1, 1000)
    .map(i -> i * 2)
    .filter(i -> i % 3 == 0)
    .subscribe(System.out::println);

Here, data is processed asynchronously and efficiently, without blocking, allowing the system to scale and respond quickly to requests.