[rob74]

Well, it's efficient if you compare it with the even newer (and even less efficient) generation of IDEs based on browser technology. Haven't used NetBeans in a while, but JetBrains are doing their very best to hide Java from you - their products come with their own (probably customized) OpenJDK so you don't have to have Java installed etc.

[prmoustache]

Scale down the speed of your processor and you quickly see what a resource hog jetbrains IDE are.