Micronaut and Quarkus are fantastic! Those startup times are exactly what you're looking for if you want to run a cloud function or lambda. I will say, that for a standard microservice, where startup time is not as important, I'd not compile to GraalVM. The cpu/memory overhead to create a GraalVM image is pretty intense. Furthermore, GraalVM doesn't optimize as it warms up like HotSpot does. That need may depend on your use case. I'm currently running Micronaut services in production that take around 5 seconds to start on JDK 1.8. The Spring Boot equivalent..... well.... 10 times that amount of time maybe?