Comment 1 for bug 505644

And what about when we're on page 40, keep the previous 30 pages loaded, or unload them?

I load All pages now for fast viewing (and loading) but yes, it taks so much ram :D so we need to decide.
We can load pages dinamically.

3 options:

   1. All pages in memory (never load nor unload)
   2. load 20 Pages and the nexts dinamically when needed (load when needed, never unload)
   3. Just have 20 pages loaded (unload and load when needed)