Vimgifs

CTRL-B


          CTRL-B will scroll one page back

CTRL-F will scroll one page forward

CTRL-D will scroll down half a page

CTRL-U will scroll up half a page

CTRL-E will scroll one line down (stands for extra line) 

CTRL-Y will scoll up one line


All commands take account, for example to page down 5 pages do
5CTRL-F

Further Reading

:h CTRL-B :h CTRL-F :h CTRL-D :h CTRL-U :h CTRL-E :h CTRL-Y

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