spring-boot-startup-bench | Benchmarks for Spring Boot startup | Application Framework library

spring-boot-startup-bench is a Java library typically used in Server, Application Framework, Spring Boot applications. spring-boot-startup-bench has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

TL;DR: if you do nothing else, then make sure you set -XX:TieredStopAtLevel=1 and -noverify as default JVM args in your IDE. They might not be recommended in a long-running, production process, but they have a really big effect on startup time. Get a fast disk (SSD). Also, don't starve your app of CPU (you need 3 or 4 CPUs to take advantage of some of the parallelization in Spring Boot, 8 is better). And use an up-to-date JVM (although actually 8u131-zulu seems to to be faster than 8u141-openjdk). Spring and Spring Boot are not slow (after many optimizations, some of which were motivated by data here). Neither component scanning, autoconfiguration, condition processing, nor anything else they do on their own is a significant source of startup time. There is some evidence that most of the cost is associated with JVM overheads, loading and parsing classes. So essentially, if you want more features (more classes) you get slower startup. See in particular the data for more detail. NOTE: if you are looking for more information on memory consumption, as opposed to startup time, please see This project uses JMH to test and report on various the effect of various parameters on Spring Boot startup times. The apps are launched in a forked JVM and the measurements below are all "seconds to start up", which includes the time from the app being executed to the point where it reports "Started" on the console.