When a trusted macro certificate is set up in the Options - Security - Macro Security -> Trusted Sources tab, and a document with signed macros is opened, the validity of the certificate is checked against a certificate revocation list in the background.

This can be problematic if the users internet connection at a certain place is permanently not available, or a custom server with the revocation list is not available. LO in such case tries to connect until a network timeout happens, which can be seen by the user as an annoying lag upon file open.

It would be desirable in such a situation have an expert config key, that disables the checking of the certificate revocation status - of course verification of the signature needs to still work.