How easy is it to export PrestaShop product feed to Shopping Engines like Google Shopping?

Just how hard is it to generate an XML or CSV file of your product feed with PrestaShop? Apparently it’s not very easy, which according to the review on Exporting PrestaShop feeds to Google Shopping.

There are some free modules, but they come with a fair mix of problems where it either takes too long to export, or it times out.