Drive En El Computador

While I'm studying i read a lot of books at the computer with Adobe's Acrobat and sometime i just fly over the pages to find something. What keeps me annoying is, that although my scrolling speed is set to fast in Windows settings, whenever i open a pdf file and zoom a little bit in to fit the screen, Adobe changes the wheel-scrolling speed of my mouse to very slow.
It seems to me, if i would try to scroll in this situation through a let's say just 20 pages ebook it could last for years to reach the end of the pages...

Any suggestions why or how to change this behavior ?