If it does the same thing (unlikely), I would turn it off. If it's just discovering and not fetching new posts, I would keep it running.
I wish Lemmy had this feature natively. Because to be honest, Lemmy Federate is a bit of a mud solution.
I would prefer a structure where community data is pulled through relays before a user follows a community and then continues as it is currently after someone follows. That could've make things easier in terms of database size, network and load, but I'm not sure if this can be done with the current ActivityPub spec.