This was discussed a while back in October 2015: Continuing the discussion from Compile hangs on "Searching for compilable files…":
Whenever I attempt to build & run Kotlin files in IntelliJ I get the message “Searching for Compilable Files…” and then it pauses for 10-20 seconds before starting the compilation. At the moment my projects are very small with a simple source path.
I am on the latest stable version of IntelliJ and the Kotlin plugin
Any ideas what is causing this delay?