I'm pretty sure there isn't a ton of background fetching asides from marking servers as unread, it can take a bit to actually load the messages when you click a

I'm pretty sure there isn't a ton of background fetching asides from marking servers as unread, it can take a bit to actually load the messages when you click an inactive server, and it won't have any new messages if you don't have a connection (even if it had a connection when it was sent)