Babylonjs editor optimization

I am trying to optimize my models and textures in the babylonjs editor.
first i compressed the models and textures and replaced them in the assets folder and re-import them to the editor scene but the scene.babylon still have the same size even after i deleted the unused objects
and re-build to project.
is there any way i can re-import my assets so my scene.babylon will have lower size or take the new imported models and texture.