VERY VERY slow Gradle build on Android Studio

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here's my config:

MBP 2015, 8gb RAM, SSD

Android Studio 2.2.3

In average, the build lasts 7/8 minutes, sometimes 10/12 minutes

I have tried EVERYTHING I could find online but none seem to work:

--- custom VM option:

-Xms1024m
-Xmx8192m
-XX:MaxPermSize=1024m
-XX:ReservedCodeCacheSize=440m
-XX:+UseCompressedOops
-XX:+HeapDumpOnOutOfMemoryError
-Dfile.encoding=UTF-8

--- Compiler / configure on demand

--- Compiler / compile modules in parallel

--- Gradle / work offline

--- gradle.properties file:

org.gradle.daemon=true
org.gradle.jvmargs=-Xmx8192m -XX:MaxPermSize=1024m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8 -noverify
org.gradle.parallel=true
org.gradle.configureondemand=true
android.enableBuildCache=true

Does anyone have any idea what's going on because it is just ridiculous

UPDATE:

Since then I switched to a 16gb RAM, there is obviously some improvement, I was under the impression that it would be less than a minute or so, but It takes 3-4 minutes, which is still not acceptable: here's part of the Gradle log that I found takes too long:

git log --pretty=format:'%h %s'
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preAlphaBuild UP-TO-DATE
:app:preBirdsBuild UP-TO-DATE
:app:preKfgBuild UP-TO-DATE
:app:prePenBuild UP-TO-DATE
:app:prePrelaunchBuild UP-TO-DATE
:app:prePtr1Build UP-TO-DATE
:app:prePtr3Build UP-TO-DATE
:app:preReleaseBuild UP-TO-DATE
:app:prepareCnPedantSweetalertLibrary13Library
:app:prepareComAndroidSupportAnimatedVectorDrawable2511Library
:app:prepareComAndroidSupportAppcompatV72511Library
:app:prepareComAndroidSupportCardviewV72511Library
:app:prepareComAndroidSupportDesign2511Library
:app:prepareComAndroidSupportMultidex101Library
:app:prepareComAndroidSupportRecyclerviewV72511Library
:app:prepareComAndroidSupportSupportCompat2511Library
:app:prepareComAndroidSupportSupportCoreUi2511Library
:app:prepareComAndroidSupportSupportCoreUtils2511Library
:app:prepareComAndroidSupportSupportFragment2511Library
:app:prepareComAndroidSupportSupportMediaCompat2511Library
:app:prepareComAndroidSupportSupportV132511Library
:app:prepareComAndroidSupportSupportV42511Library
:app:prepareComAndroidSupportSupportVectorDrawable2511Library
:app:prepareComAndroidSupportTransition2511Library
:app:prepareComCrashlyticsSdkAndroidAnswers1310Library
:app:prepareComCrashlyticsSdkAndroidBeta122Library
:app:prepareComCrashlyticsSdkAndroidCrashlytics265Library
:app:prepareComCrashlyticsSdkAndroidCrashlyticsCore2314Library
:app:prepareComDevbracketsAndroidExomedia311Library
:app:prepareComEftimoffAndroidViewpagerTransformers101Library
:app:prepareComGithubCastorflexSmoothprogressbarLibrary110Library
:app:prepareComGithubHotchemiPermissionsdispatcher230Library
:app:prepareComGithubKibotuAndroidAnimationsActions107Library
:app:prepareComGithubKibotuBloodHound105Library
:app:prepareComGithubKibotuCommonAndroidUtils072Library
:app:prepareComGithubKibotuGooglePlayForceUpdate108Library
:app:prepareComGithubKibotuNetKibotuAndroidDeviceinfo121Library
:app:prepareComGithubKibotuOpenAndroidSSLWrapper107Library
:app:prepareComGithubKibotuRecyclerViewPresenter141Library
:app:prepareComGithubKibotuShareIntentBuilderV003Library
:app:prepareComGithubKibotuTimeBomb110Library
:app:prepareComGithubKibotuUrlShortener107Library
:app:prepareComGithubOrhanobutHawk123Library
:app:prepareComGithubOzodrukhCircularReveal201Library
:app:prepareComGoogleAndroidExoplayerExoplayerR1513Library
:app:prepareComGoogleAndroidGmsPlayServicesAds1001Library
:app:prepareComGoogleAndroidGmsPlayServicesAdsLite1001Library
:app:prepareComGoogleAndroidGmsPlayServicesAnalytics1001Library
:app:prepareComGoogleAndroidGmsPlayServicesAnalyticsImpl1001Library
:app:prepareComGoogleAndroidGmsPlayServicesBase1001Library
:app:prepareComGoogleAndroidGmsPlayServicesBasement1001Library
:app:prepareComGoogleAndroidGmsPlayServicesClearcut1001Library
:app:prepareComGoogleAndroidGmsPlayServicesGass1001Library
:app:prepareComGoogleAndroidGmsPlayServicesGcm1001Library
:app:prepareComGoogleAndroidGmsPlayServicesIid1001Library
:app:prepareComGoogleAndroidGmsPlayServicesLocation1001Library
:app:prepareComGoogleAndroidGmsPlayServicesTagmanagerV4Impl1001Library
:app:prepareComGoogleAndroidGmsPlayServicesTasks1001Library
:app:prepareComGoogleFirebaseFirebaseAnalytics1001Library
:app:prepareComGoogleFirebaseFirebaseAnalyticsImpl1001Library
:app:prepareComGoogleFirebaseFirebaseCommon1001Library
:app:prepareComGoogleFirebaseFirebaseCore1001Library
:app:prepareComGoogleFirebaseFirebaseIid1001Library
:app:prepareComGoogleFirebaseFirebaseMessaging1001Library
:app:prepareComJakewhartonButterknife840Library
:app:prepareComJakewhartonProcessPhoenix110Library
:app:prepareComMikepenzFastadapter210Library
:app:prepareComMikepenzIconicsCore280Library
:app:prepareComMikepenzMaterialdrawer581Library
:app:prepareComMikepenzMaterialize100Library
:app:prepareComMukeshMarkdownview100Library
:app:prepareComNightonkeJellytogglebutton102Library
:app:prepareComNightonkeWowoviewpager102Library
:app:prepareComOgaclejapanSmarttablayoutLibrary161Library
:app:prepareComOgaclejapanSmarttablayoutUtilsV4161Library
:app:prepareComPnikosisMaterialishProgress10Library
:app:prepareComSbrukhandaFragmentviewpagerFragmentviewpager100Library
:app:prepareComShawnlinNumberPicker101Library
:app:prepareComSloydevPreferator100Library
:app:prepareComYydcdutRxmarkdown005Library
:app:prepareComZplesacConnectionbuddy140Library
:app:prepareHanksXyzHtextviewLibrary015Library
:app:prepareIoFabricSdkAndroidFabric1314Library
:app:prepareIoNlopezSmartlocationLibrary329Library
:app:prepareIoReactivexRxandroid121Library
:app:prepareJpWasabeefGlideTransformations201Library
:app:prepareJpWasabeefRecyclerviewAnimators225Library
:app:prepareMeGrantlandAutofittextview021Library
:app:prepareMeRelexCircleindicator122Library
:app:prepareNetDanlewAndroidJoda297Library
:app:prepareUkCoChrisjenxCalligraphy220Library
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig
:app:mergeDebugShaders UP-TO-DATE
:app:compileDebugShaders UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:fabricGenerateResourcesDebug
:app:generateDebugResValues UP-TO-DATE
:app:processDebugGoogleServices
Parsing json file: ../google-services.json
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugResources
:app:generateDebugSources
:app:incrementalDebugJavaCompilationSafeguard
:app:javaPreCompileDebug
:app:compileDebugKotlin

up until here is fine, but the :app:compileDebugKotlin takes around 60+ seconds ...

and then,

...
...
:app:copyDebugKotlinClasses
:app:compileDebugNdk NO-SOURCE
:app:compileDebugSources
:app:transformClassesWithRetrolambdaForDebug
:app:transformClassesWithDexForDebug

This last line stays for so long as well.

6 Answers

A possibility is that there is an unreachable URL on your allProjects bracket of your project level build.gradle file. Since Gradle scans the URLs on that bracket in order from top to bottom and there are, let's say, 10 missing components that it needs to download, it starts to scan from the top and waits for the URL to return a response. And, there is a possibility that the URL will cause a timeout without returning a reply, and that'll cause Gradle to wait for the URL for each missing component, increasing the build time by a lot.

My suggestion would be inserting the maven roots to allProjects bracket from the most necessary to least necessary, from top to bottom and ensure all URLs are reachable. I've decreased the build time of some of my projects from 15 minutes to 30 seconds after fixing the endpoints.

It also relates to this answer where the link in question is unreachable: https://stackoverflow.com/a/67569873/6276596

Hope this helps to somebody.

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