Seems like ART is busy in DexFileVerifier, trying to optimize or check something. Do you have a huge DEX?

Tips:

• Check if you have minification enabled in your build.gradle:

  android {
      buildTypes {
          release {
              isMinifyEnabled = true // Enables minification
              // Also recommended to enable resource shrinking
              isShrinkResources = true
          }
      }
  }
  

• If that does not help, you can try multidex: https://developer.android.com/build/multidex