Hi everyone, recently my team and I upgraded our application from Grails 2.5.6 to Grails 4.1.3. We noticed a significant performance drop when running the application with

grails run-app

compared to using the

./gradlew

command in the development environment. Does anyone know why this happens or what could be causing this difference?

The jump from 4.x to 7.x is not nearly as painful since it's documented in the upgrade notes. I'd suggest you update - this will allow you to go to Java 17, have a modern build system, and numerous other fixes. The performance will be very noticeable.

run-app and bootRun are not really useful for evaluating performance. I'd do bootJar/bootWar and java -jar myapp.jar for analyzing anything performance related.