Android Gradle Build Slow

Question

I am trying to understand why our Gradle build is so slow. Currently, every time you click build without changes, the build time is about 45 seconds. This is a single module project. I have enabled profiling and most of the time is spent on: app: dexDebug. We are building using Gradle 2.8, and my dex options are as follows:

dexOptions {preDexLibraries = false incremental true javaMaxHeapSize "4g"}

From the profile report:: app 43.957s (total): app: dexDebug 28.727s

Is there any way to speed this up? Why does dex need to be restored every time?

Answer 1

This may shed light:

http://tools.android.com/tech-docs/instant-run

Gradle transformClassesWithDexForDebug

https://code.google.com/p/android/issues/detail?id=187443&q=attachments%3D0&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars

:

//    dataBinding {
//        enabled = true
//    }

 ./gradlew  assembleDebug --profile