I second this. testing exporting one page built also with Divi 5.13.1 resulted in 1864 files and weighs 182 megabytes. browser dev tools shows that only 26 files (300kb) are used to load the whole page.
wp-includes and wp-content weighs ~%95 of the export.
\wp-content\uploads and \wp-includes\js specifically. Ive also noticed that the raw plugins zip is being included in \wp-content\uploads (Divi.zip and others).
Is there any workaround currently? I am searching for a similar solution to see if it fits migrating client. Thank you!