Faster rendering of pages in ThumbView

Hello,
I use your library for reading PDF magazines and I use ThumbView. The loading (rendering) of the pages in the ThumbView is very time consuming. For magazines, which have a lot of pages with lot of pictures, the loading of one page takes for example 2 seconds.
For pages, which contain only text, the loading is fast.
So, my question: Is there any way how can I improve the time of loading of pages?
Thanks a lot.