It seems to be lagging behind by hours.

For instance, this thread on lemmy.world shows 5 comments and 56 upvotes, while the same thread on lemmy.sdf.org has 3 comments and 24 upvotes only. And the weird thing is, I posted this thread from lemmy.sdf.org, as well as one of the comments, and outgoing is instantaneous. It's just incoming comments and votes that don't seem to come through.