{preamble} is everything before \begin{document} in a LaTeX document. It contains commands loading packages, definitions, and usually most style settings for a document.

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Speeding up compilation using precompiled preamble with LuaTeX

Compiling my documents with lualatex takes quite long. I have a complex preamble, and noticed it takes long to process this part of the file. Today I came across this website, which proposes a trick ...