accelerate is a Vim plugin to define a special key mapping to accelerate key repeating. For example, to accelerate cursor movements using |hjkl| in Normal and Visual mode:
call accelerate#map('nv', '', 'h')
call accelerate#map('nv', '', 'j')
call accelerate#map('nv', '', 'k')
call accelerate#map('nv', '', 'l')- Vim 8.0 or later
You can access the documentation from within Vim using :help accelerate.