There are some thing, which could help a bit:
1) In Settings->Build->Compiler and add Command line options:
--offline --parallel
and VM options:
- -Xmx2048m -XX:MaxPermSize=512m- -
2) In the file gradle.properties add line org.gradle.daemon=true
3) Give a try to Genymotion emulator.
4) Move project to SSD disk. Or flash disk - build time can drop to half.
Last option is not to use AS and Gradle at all. Switch to Eclipse (make new project, move res and src files + import all libraries you using, for example NDK is easier to set up there), but it's also not that "heavy" and up to date as AS, so probably not much helpful after all.
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