1. I like pdf xchange viever and I am using it for very long long time
it has tabs that I loved from very begining and it has maximum real state for reading files, no stupid menus that take spaces 
if I had option to remove title bar it would be awesome (like firefox) I have 17' laptop so I choose minimalism to have maximum reading space 2. Also
it has very low memory footprint which is very good (20 pdf files ~ 200mb), others like Adobe Acrobat ~ 2GB 
recently I started to read magazines and when I choose next page it needs ~0.4 sec to load page. It is very noticeable. I think because of loading only pages that are read it has very low memory footprint, so my question is, is there an option to preload 3 pages, e.g. if i am on page 10, to load pages 10,11,12 and 13 