Leyden aims to address the startup time of Java applications. For monoliths and single applications, Java sometimes took a while to get going, but once up and running, they were fast. “That’s great if your app server is going to run for two weeks or two months or two years, but it’s not that great if you want to run for 30 milliseconds,” said Saab. Server-side software is getting smaller and more distributed, so quick starts are key to fast response times.