Hej Im working with the Android side of a multiplatform proj Gradle Community #community-support

Hej! Im working with the Android side of a multipl...

Zoltan Demant

04/08/2025, 12:55 PM

Hej! Im working with the Android side of a multiplatform project, and Ive been completely pwned by the build times. To the point that Im fairly certain that something is terribly wrong. • Compiling and running the desktop variant takes roughly 2 seconds on average. I dont have any data for this specifically, but its very quick. • When it comes to Android, Im seeing average build times of around 5 minutes and looking at a build scan I can see that some very small modules take a few minutes to compile. This tells me that something is at odds, but I dont really understand what that might be? More details in 🧵

Zoltan Demant

04/08/2025, 1:02 PM

For example, in the timeline view of a build scan I can see that: :navigator 3m 38.866s That module is just a shared module between many other modules. It has one object, and a sealed interface with ~50 classes. This is the involved

build.gradle.kts

file:

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plugins {
    alias(config.plugins.multiplatform.android)
    alias(config.plugins.multiplatform.jvm)
}

kotlin {
    sourceSets.commonMain.dependencies {
        api(config.aggregate.core)

        implementation(libs.coroutines)
    }
}

config.plugins.multiplatform.x

are convention plugins that I share between my projects, containing stuff like:

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configure<KotlinMultiplatformExtension> {
    applyDefaultHierarchyTemplate()

    compilerOptions {
        freeCompilerArgs.addAll(CompilerArgs)
    }
}

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val CompilerArgs =
    listOf(
        "-Xskip-prerelease-check",
        "-Xexpect-actual-classes",
        "-Xcontext-receivers",
        "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
    )

And

jvm() android()

etc. Im really clueless unfortunately, this project is even just a subset of the whole project - ironically to speed up build times when developing a subset of its features.

Laura Kassovic

04/08/2025, 6:59 PM

@Zoltan Demant, can you share the project source code so I can replicate it or can you create a Build Scan by any chance?

Zoltan Demant

04/09/2025, 2:59 AM

Thanks for the response @Laura Kassovic; I was able to solve the issue (I also posted this in the kotlin slack for multiplatform). Ill share the findings here in case it helps anyone else: Comment that 💡: "does https://blog.jetbrains.com/kotlin/2022/06/introducing-kotlin-build-reports/ help narrow down what is slow within the kotlin compile?" ---- "Awesome, that helps a lot: No incremental compilation due to

kotlin.compiler.execution.strategy=in-process

(I added this yesterday after asking AI about the issues). One of my convention plugins for multiplatform adds (by mistake) android-library to every module its applied to. Ive been using this for a lot of projects, I think the extra time just grows exponentially due to this project being ridiculous in size. These two tweaks brought the build time down from 5 minutes to 5 seconds. "

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