Why plain java (hello-world example) is faster than spring boot example on move evaluation speed ?

[hangocanh2303]

Hi all,
when i use timefold example for school timetable schedule, I found the following:
Spring boot example: https://github.com/TimefoldAI/timefold-quickstarts/tree/stable/java/spring-boot-integration
Solving ended: time spent (5000), best score (0hard/10soft), move evaluation speed (93338/sec), phase total (2), environment mode (REPRODUCIBLE), move thread count (NONE).

Hello-world example: https://github.com/TimefoldAI/timefold-quickstarts/tree/stable/java/hello-world
Solving ended: time spent (30000), best score (0hard/11soft), move evaluation speed (27671/sec), phase total (2), environment mode (REPRODUCIBLE), move thread count (NONE).
why is there a difference in speed while the code is the same ?

[Christopher-Chianelli]

This is because mvn spring-boot:run by default optimizes the launch, which disables the C2 compiler to improve startup speed. The same difference (for the same reason) can be observed in Quarkus' Dev mode. To get better performance, run with java -jar path/to/app.jar.