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kotlinlang

```In addition to performance improvements, we added an experimental option to run kapt, the Kotlin annotation processing tool, directly using Gradle workers. In some cases, this may significantly improve the overall build speed. To switch to the Gradle worker implementation, add the kapt.use.worker.api=true``` 
Coworker tried this and it seemed slower… 
 
Looks like it uses `IsolationMode.PROCESS` which creates a new process for each worker…
<https://github.com/JetBrains/kotlin/blob/master/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptWithoutKotlincTask.kt#L76> (edited)

`IsolationMode.NONE` could be faster…
<https://docs.gradle.org/4.9/javadoc/org/gradle/workers/IsolationMode.html>