[luatex] extreme slow down using pre release TL 2022 with lualatex

[Nasser M. Abbasi]

I installed TL 2022 yesterday using the command

install-tl -repository http://www.math.utah.edu/pub/tlpretest/

All went well.

I tried to compile a very large file I have using lualatex
which should take about 30-40 minutes using TL 2021
(it is about 40,000 PDF pages) and lualatex has now been running
for almost 12 hrs at near 97% CPU on linux ubuntu. No errors
or anything, but it is still running as we speak and I have no idea why
it is taking this long and how much more time I need to wait.

-------------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
18540 me        20   0  957616 941092   6748 R  97.7  1.8 462:15.76 lualatex
----------------------------

>which lualatex
/usr/local/texlive/2022/bin/x86_64-linux/lualatex

>lualatex --version
This is LuaHBTeX, Version 1.15.0 (TeX Live 2022)
Development id: 7509

This  is ubuntu under windows 10 Linux subsystem.

On same system, TL 2021 lualatex is much much faster.

What can I do to find why it is taking so long? or
what is it doing?

Sorry I can't make MWE or anything like this as I
have no idea where the problem is.

But I am happy to try anything.

The command I use is

     lualatex  --shell-escape --file-line-error filename.tex

>uname -a
Linux DESKTOP-7OK6FOH 5.10.60.1-microsoft-standard-WSL2
   #1 SMP Wed Aug 25 23:20:18 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

--Nasser