One another thing to try: set the MTU to 9000. But don't do this on your main interface, or you'll get haunted by traffic being blackholed. At home, I have sep

One another thing to try: set the MTU to 9000. But don't do this on your main interface, or you'll get haunted by traffic being blackholed. At home, I have separate VLANs for the 9k packets. It has a separate subnet (both V6 and V4), so it works perfectly. The devices on this VLAN use it directly if they can, and everything else goes through the router that sends proper ICMP "too big" messages.