android studio 升级到2.2版本，慢了。解决方法

/applications/Android Studio.app/Contents/bin

打开文件studio.vmoptions

-Xms256m-Xmx1280m-XX:MaxPermSize=350m-XX:ReservedCodeCacheSize=240m-XX:+UseComPRessedOops

改成

-Xms512m-Xmx2560m-XX:MaxPermSize=350m-XX:ReservedCodeCacheSize=240m-XX:+UseCompressedOops

解决