When you run the application for the first time, it will download all dependencies from the remote repositories to local repositories so it is a bit time taking process so the application may face a delay. From the second time and onward when you start the application, it will load libraries from the local repos and missing libraries from the remote, so it needs a few seconds to organize this whole process.

Removing unwanted dependencies from your pom.xml can significantly improve the performance of your application.