commit https://github.com/vim/vim/commit/b01f357791f88c7083e58cf2b36509dd83f21ea2 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 15 15:17:04 2016 +0100 patch 7.4.1091 Problem: When making a change while need_wait_return is set there is a two second delay. Solution: Do not assume the ATTENTION prompt was given when need_wait_return was set already.

" Vim compiler file
" Compiler:     ATT dot
" Maintainer:	Marcos Macedo <bar4ka@bol.com.br>
" Last Change:	2004 May 16

if exists("current_compiler")
  finish
endif
let current_compiler = "dot"

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

CompilerSet makeprg=dot\ -T$*\ \"%:p\"\ -o\ \"%:p:r.$*\"