I have a multi-project (~10 modules) of which building takes about 20-30 seconds each time. When I press Run in Android Studio, I have to wait every time to rebuild the app,
Just create a file named gradle.properties in the following directory:
/home//.gradle/ (Linux) /Users//.gradle/ (Mac) C:\Users\\.gradle (Windows)
Add this line to the file:
org.gradle.daemon=true
For me the speed is now equal to Eclipse.
Source: https://www.timroes.de/2013/09/12/speed-up-gradle/