[MacRuby-devel] Confusing with The memory a macruby app used

Hi: I want to write an app with macruby , and want to make sure there's not memory problem. I create an Macruby-Application with Xcode ,and lanuch it ,using the Activity Monitor , it using about 44M memory ,and create an ObjectivC-Application ,it only use 8M memory ,is it normal? thanks