I have a very simple use case. I'm using BitTorrent Sync to sync files between my desktop PC and my Android phone across the LAN (nothing internet at all). I have an Asus RT-AC68U router and I have the listening port specified in Advanced Preferences configured for port forwarding to the desktop PC IP in the router. I'm connected via Wifi to the 5Ghz side of the router and with the phone sitting next to the PC and showing a 433Mbps WiFi connection speed when using BitTorrent Sync I get 500 KB/s which seems way low. I'm gathering log information on a transfer I'm completing this morning. Please let me know where I can send it and I'll be happy to provide it.