how to decrease the cocos2d-x 3.0 project size

Hi:
I used the create_project.py to create a new empty cocos2d-x project, and then generate the install package, it used to be 3.5M. Now I need to decrease this package for some reason, but when I removed some unused file reference like cocoStudio Gui etc. in cocos2d_libs.xcodeproj. But when I generate the install package again, it was still 3.5M. Can some one tell me how to decrease the package size by remove cocos2d-x’s file.

Thanks a lot!