Problems with Bookplayer Sluggishness with VoiceOver

Hello,
I've been a long-time user of BookPlayer on my iPhone for listening to audiobooks, and I've noticed in the last month or so, when I add a new book to BookPlayer, VoiceOver becomes very sluggish in the list of books around that new book. I can flick rather fast through my list of books, but as soon as the new books are encountered, VoiceOver takes quite a while to read the titles and sometimes jumps focus back up in the list. Has anyone else experienced this? I have written to the support email address, but have yet to hear anything back.
Thanks!