Slow Application Startup on Replit

1. Large number of beans and autoconfiguration
2. Component scanning entire classpath
3. Eager database connection initialization
4. Loading all data on startup
5. Hibernate scanning all entities

Use spring-boot-starter-webflux for async. Defer non-critical beans with @Lazy. Exclude unnecessary autoconfiguration: @SpringBootApplication(exclude={...}). Move startup data loading to lazy-loaded service. Use spring.jpa.properties.hibernate.hbm2ddl.auto=validate instead of create/update. Profile startup with --debug flag.