5.5.1 Automatic Customization for the Site
Assuming that the automatic customization at the global level was done when AUCTeX was installed, your choice is now: will you use it? If you use it, you will benefit by having access to all the symbols and environments available for completion purposes. The drawback is slower load time when you edit a new file and perhaps too many confusing symbols when you try to do a completion.
You can disable the automatic generated global style hooks by setting the variable TeX-auto-global
to nil.
user option
TeX-macro-globalβ
Directories containing the siteβs TeX style files.
user option
TeX-style-globalβ
Directory containing hand generated TeX information.
These correspond to TeX macros shared by all users of a site.
user option
TeX-auto-globalβ
Directory containing automatically generated information.
For storing automatic extracted information about the TeX macros shared by all users of a site.