Does EWWW replace WP’s initial compression?

Hello again,

My question is this: does EWWW replace the default compression that WordPress uses?

As I understand it, the logic is as follows:

1. User -> upload image
2. WP -> compress & resize
3. WP -> generate thumbnails

Would EWWW replace steps 2 and 3? It wouldn’t make much sense to compress an image that WordPress has already compressed initially, essentially a double process.

1. User -> upload image
2. EWWW -> compress & resize
3. EWWW -> generate thumbnails