the paging option is already a feature request and a good idea for displaying many items of a collection. 45 are quite a few and if they are not cached it’s a lot of work to do to display all of them (one request to Amazon for each).
At this time it is not a good practice to put 45 item in a collection if you want to display the whole collection on one page. The rendering load is just to much. Future versions will definitly focus on this issue. But for now I would recommend to split it into to several collections and several posts / pages and of course to use the cache.