[Stinger]

I saved a couple wikipedia articles to HTML, and made ePubs out of them using Sigil (it did a better job than Calibre with the formatting and structure).

The resulting epubs look great on the Kobo, but they take forever to open. Even the processing time when I loaded these two on my Kobo was unusually long (about 2 minutes). This is strange because overall, they are pretty tiny.

I'm thinking it has something to do with the heavy CSS, but since it takes so long to load and open them, I haven't found the patience to try and narrow it down to what specifically is causing this.

EDIT: Even flipping past sections, which are are separate HTML files within the epub takes a good 10 seconds.

If anyone feels like playing detective, I've attached the two epubs.