Good but laggy

A great reader now that Stanza has been discontinued, but the program has started to become very laggy on my 4S. There were no problems when I first started using it, but I must have close to 250 books from the public domain now (which I realize is a bit excessive, but...), and Ive noticed a considerable slowdown. Please fix this!

ragnamuffin about Bluefire Reader, v1.9.4