Own implementation of a dict server. Is dict lookup multi threaded or single threaded?

Hi,

I have created my own dict server (proxy:[<dict path>]:<destination dict>) to access a proprietary database.

What happens if the dict server lookup is slow? for example because the lookup process takes some time?

Does Dovecot access the dict proxy from multiple threads or is this a single threaded process?

Kind regards,

Martijn Brinkers