Speeding up compilation using precompiled preamble with LuaTeX

I might be missing the point of the question, or fail to see why what my computer does is not what the OP is looking for. Further this is is certainly not the most elegant solution, since I'm at work so I only had Windows & TeXnicCenter+MikTEX2.9 at my disposal. But I think it does what it should.

Here's what I do:

1. Compile lua_pream.tex with profile LuaTeX⇨PDF(pre) (see below)
2. Compile lua_nopream.tex with profile LuaTeX_post⇨PDF(post)

The profiles:

LuaTeX⇨PDF(pre) is

luatex  -interaction=nonstopmode -ini -jobname="lua_pream" "&lualatex" mylatexformat.ltx "./lua_pream.tex"

or in TeXnicCenter:

LuaTeX_post⇨PDF(post) is

lualatex -fmt lua_pream "./lua_nopream.tex"

or in TeXnicCenter:

lua_nopream.tex contans not much really

endofdump %%stuff from lua_pream.tex is dumped before here, you only need this if you have a local preamble
% part of the preamble that has to be evaluated each run
begin{document}
The preamble used for this was compiled with vvvv set to vvvv
end{document}

lua_pream.tex contains the preamble

% static part of the preamble (stuff that does not change every now and then)
documentclass{article}
usepackage{luatexbase}
usepackage{geometry}
usepackage{amsmath,amsfonts,amsthm}
usepackage{graphicx}
usepackage{caption}
usepackage{subfig}
usepackage{booktabs}
usepackage{enumitem}
usepackage{xspace}
usepackage{cleveref}
usepackage{hyperref}
usepackage{natbib}
defvvvv{foobar}
% the endofdump part 'saves' everything above into one precompiled preamble, which gets loaded every time the LaTeX document is processed. This saves a lot of time mostly. 
% NOTE: the following line ends the dumping into the preamble format file!
endofdump
begin{document}
        This text plays no role I guess
end{document}