Can anybody comment on this? Two example projects with 500 classes: git clone https://github.com/asolntsev/big-app.java git clone https://github.com/asolntsev/big-app.kotlin big-app.java> time gradle classes 0m23.593s big-app.kotlin> time gradle classes 9m34.467s

rebuilding my project takes a minute and a half but the kotlin part is under 300 classes I think. The rest is java with a similar # of classes. But most of my kotlin classes are under 500 lines

maybe this part is the culprit?

task libs(type: Sync) {
  from configurations.compile
  from configurations.testCompile
  into "$buildDir/lib"
}

compileKotlin.dependsOn libs

I'll check

which version of gradle do you use for this build?

It's very suspicious, I'll take a look into this

I've identified part of the problem. Check my comment in the issue.