I use Alt-numpad keys. In my case it works quite fast: " Decrease height / width...

BostX on April 21, 2013 | parent | context | favorite | on: Vim Splits – Move Faster and More Naturally

I use Alt-numpad keys. In my case it works quite fast:

    "  Decrease height / width
    nnoremap <A--> <C-W>-
    nnoremap <A-/> <C-W><
    " Increase height / width
    nnoremap <A-+> <C-W>+
    nnoremap <A-*> <C-W>>