I've noticed many actions in ereader lock up the UI until they complete. For example, when I finish an article, I usually select "archive". The article list is then displayed, but I can't interact with it for several seconds until the article is archived and disappears from the list. Sometimes this takes as long as ten seconds.
Is there something happening locally on the device that is slows down the processing step?
Alternatively, couldn't the archive action happen in the background such that I could start reading the next article while the backend Instapaper API call occurs in the background?