pdf file exported from affinity is huge

[Hythus]

I don't know if this is a common issue but the pdfs I exported from every package are over 100 mb. about 10 pages, 300 dpi. fatten export. Never been an issue in Adobe. wondering what's happening 

[GarryP]

If you can give us some details about the images/files used in your document and the export settings, or (even better) the document itself, then we might be able to help.

Otherwise there’s not enough information for us to have any idea of what you are working with or whether you are getting an expected result when exporting from it.

[thomaso]

12 hours ago, Hythus said:

fatten export. Never been an issue in Adobe.

One guess: You used different export settings ?

If "fatten" is meant to be the "flatten" preset in Affinity: As far I know Adobe does not have a preset with this settings. Also note, "flatten" causes rasterization for every layout element, text and other vector objects included, which leads to a larger file size.