android studio 2.0 preview 8 take too much memory and long build gradle

i use android studio version 1.5 stable and i try to use android studio 2.0 and it very long time to build it takes 10 minutes best time 5 minutes

and it take too much memory and make my computer hang.so if  i prefer to use android 1.5 stable version just need 16 sec

i hope this article make you know what the faster android studio to build