How to improve the speed of files list reading under directory in completion

[Christopher M. Miles]

I'm using =vertico= and =marginalia= to get minibuffer completion.

When I press =[C-x C-f]= to try to open a file under current directory (this 
directory is on home QNAP
NAS and contains 4356 files). But it took 3 seconds to show up candidates, when 
I input one
character, filtering is also very slow.

#+begin_src shell
ls -l | wc -l
#+end_src

#+RESULTS[(2021-11-07 00:07:42) 8103eabbf0c6408f1637cafcb1621f3abd36f61d]:
:     4356

Then I toke Emacs built-in profiler benchmarking, I attached the result in to 
email attachment files.

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profiler-cpu-report.txt
Description: profiler cpu report

profiler-memory-report.txt
Description: profiler memory report

signature.asc
Description: PGP signature