Adobe Captivate 2017 project size vs. Captivate 9 project size

I recently built a new project in Captivate 2017 and was having issues optimizing the size to play well in our LMS. I rebuilt the same project(same images and audio) in Captivate 9 and it saved as a third of the size that it was in Captivate 2017. ( example Cap.9  was 112 MB and Cap. 2017 was 360 MB ) Has anyone else noticed this and have suggestions on how to optimize the size in 2017?