10.4.3 Can you answer these questions?

10.4.3.1 Lualatex Precompile Preamble Stops Randomly

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706466

to speed up the compilation of my tex-file I came across the idea of precompiling the preamble following this explaination:https://web.archive.org/web/20160912114941/http://www.howtotex.com:80/tips-... 
[luatex] [preamble]
 

asked by simonroof https://tex.stackexchange.com/landing/r/digest?cta=user&id=309263 Score of 1

10.4.3.2 Inserting code environment in an endnote

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706442

I am currently writing a report in which I have to include many bits of code in endnotes on a different page. Doing every reference manually seems unnecessarily tedious. I found a way to insert python ... 
[code] [endnotes]
 

asked by Galou https://tex.stackexchange.com/landing/r/digest?cta=user&id=311960 Score of 1

10.4.3.3 \includegraphics that works differently within and outside of figure environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706597

I want to redefine \includegraphics so that while it works as usual within a figure environment, it is centered automatically outside of figure environments. 
This is my try: 
\documentclass{article} 
\... 
[beamer] [macros]
 

asked by user182849 https://tex.stackexchange.com/landing/r/digest?cta=user&id=182849 Score of 1