As a bit of a frame-challenge, consider learning some more :help motion (the full list is long; take it slow!).
Some particular useful ones:
search / and ?, along with shortcuts */gd/etc.
scrolling Ctrl and any of d/u/b/f
moving in a line f/F/t/T
various text-object motions )/}/etc.
As a bonus, these motions combine orthogonally with ...
It is impossible to do from within vim or gvim. That is what operating system does for all keypresses (I doubt you can separately increase it only for specific keypresses)
For windows it is:
For OSX or linux there should be similar settings.
I would suggest to use more navigation facilities vim has:
/funcname<CR>nnn search if you know specific ...