Recirculating fan has about 70% of the efficiency of a ducted one as long as filters are in good condition, however extraction rates can vary from 230 up to 850+ cubic meters per hour so a recirculated high end one can actually be better than a lkow ducted.
Having said this to work correctly a extractor should be on for about 20 mins b4 cooking to ‘get the flow going in the right direction’. No one does this so alot of the above is immaterial tbh