refer-cache-bib-files

refer-cache-bib-files is a variable defined in `refer.el'.
Its value is

t

• Automatically becomes buffer-local when set.

Documentation:
Variable determining whether the value of `refer-bib-files' should be cached.
If t, initialize the value of refer-bib-files the first time it is used. If
nil, re-read the list of \.bib files depending on the value of `refer-bib-files'
each time it is needed.

You can customize this variable.