Speed of displaying books

I have some trouble with the speed of displaying my books. It seems to be, that older books

http://de.blurb.com/books/1575318  Zwei
http://de.blurb.com/books/2304358  Eins
http://de.blurb.com/books/2303662  Grubenfahrt
http://de.blurb.com/books/2236106  Achsen

are shown very more faster than newer onces.

http://de.blurb.com/books/2610774  Georgien
http://de.blurb.com/books/2610688  Aserbaidschan
http://de.blurb.com/books/2613606  Armenien
http://de.blurb.com/books/2635083  LandTanz

Unfortunable the technic has no idea nor  a solution yet. I suppose. that there is a bandwith problem with a new computercenter. Have anyone similar problems and a solution?