Spring Boot 3.x, with the release of Java 21, brings groundbreaking improvements in performance, concurrency, and observability.Java 21 features align perfectly with Spring Boot's microservice model, offering blazing speed and non-blocking IO with Spring WebFlux + R2DBC.Native Java is now the new standard for serverless and edge computing, no longer experimental.Spring Boot 3.x offers a mature and intuitive development experience with a growing community and rich ecosystem.