Internals: How Spring Boot 3.3’s New AOT Compilation Reduces Startup Times by 40% for 50k LOC Apps Spring Boot 3.3 introduces a revamped Ahead-of-Time (AOT) compilation pipeline, delivering up to 40% faster startup times for mid-sized applications (50k lines of code, or LOC). This article dives into the internal architecture changes driving this performance leap, benchmarks from real-world 50k LOC workloads, and practical steps to adopt the new AOT engine. What is AOT Compilation in Spring Boot? Traditional Spring Boot applications rely on runtime reflection, proxy generation, and classpath scanning to wire beans, resolve dependencies, and configure auto-configuration rules. These steps run every time the application starts, adding significant overhead for large codebases.…