[altfredd]

Android used to have lighting-fast builds even when accounting for Google's quirky tooling, R.java generation and binary XML processing. After introduction of Gradle build system and Kotlin Android build times have become laughingstock of entire programming world.

This however has nothing to do with Java — Kotlin compiler is written Kotlin, and Gradle is written in unholy mix of Kotlin, Java and Groovy (with later being especially notorious for being slow).