artist-flood-fill-show-incrementally

artist-flood-fill-show-incrementally is a variable defined in `artist.el'.
Its value is

t

Documentation:
Whether or not to incrementally update display when flood-filling.

If non-nil, incrementally update display when flood-filling.
If set to non-nil, this currently implies discarding any input events
during the flood-fill.

You can customize this variable.