@orangy hitting Cmd + F9 or Cmd + Shift +F9 in IntelliJ when the application is started with Jrebel. In a java project this takes around half a second, with Kotlin and incremental compile 32 seconds and with incremental compile off, 12 seconds. I've sent some logs to the Jrebel guys and they are looking at it, but the bulk of the time seems to be the Kotlin compiler.