advancedSpring Boot Core
Your Spring Boot application takes 60+ seconds to start — how do you optimize it?
Profile startup with `--debug` and Spring Boot's built-in startup tracking (ApplicationStartup/Micrometer), then look for slow auto-configurations, excessive component scanning scope, eager bean initialization that could be @Lazy, and heavy @PostConstruct work — often it's a small number of specific beans, not Spring itself, causing most of the delay.
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