Sébastien Deleuze explains how to enhance runtime efficiency in Spring Boot applications using Spring Boot 3, Java 21, and Class Data Sharing (CDS). Key focuses include minimizing startup time, reducing memory consumption, and optimizing container deployments. Deleuze introduces features such as native image support, ahead-of-time (AOT) optimizations, and virtual threads, which collectively improve application performance and scalability. He also highlights improvements in developer experience with Spring Boot 3.1 and the integration of CDS in Spring Boot 3.3, demonstrating practical steps and benchmarking results to showcase these optimizations.

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