What PDF settings are used when creating DPS articles?

When you create a PDF file using Acrobat Distiller or InDesign you can modify settings such as font subsets, image down-sampling and compression which will have an impact on the final file size. Does anyone know what settings are used when articles are rendered in PDF format in DPS and can the settings be modified? Specifically, what type of compression is applied to images? If I were to place two images on a page, a png and a jpg with medium quality, would they be embedded in the PDF as is or re-compressed in another format and/or level of quality?

Thanks for your help.
So images placed in an InDesign retain their original file format and are unzipped when the article is loaded in the app.
I'm assuming that if compression is applied to the original image files it can have an impact on performance. If you were to use jpeg files in a document they would need to be unzipped and decompressed. I've read other forum posts that suggest the iOS jpeg decompression engine is too slow to present a fluid user experience in a DPS app. The combined processing time of unzipping and decompressing jpegs files may steer me towards the png format.

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