[luatex] LuaLaTeX's performance

[Pander]

Hi all,

I'm new here so please forgive my lacking knowledge of LuaLaTeX.

I'm compiling a font catalogue in XeLaTeX but am more and more compelled
to switch over to LuaLaTeX because of better font support.

At the moment, only two things are obstructing this. First is missing
support for polyglossia, but as I gathered, people are working on this.

The other thing is the performance. Now it could be that the current
executable is not optimised and is doing loads of debug logging.
However, my font catalogue is a good test case.

XeLaTeX can process it in two parts because other it runs out of memory.
However, LuaLaTeX is hitting some sort of performance barrier halfway my
document and after using up almost 6 GB of memory I have to kill off the
process. Please see attached screenshots of memory usage.

How can LuaLaTeX's performance be improved? Is the current executable in
TLContrib a debug build with maximum logging?

Best regards,

Pander
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