I just recently bought a realm and was playing it perfectly fine with my friends for about 4 or 5 hours straight but out the blue the realm started to lag a ridiculous amount.  Ever since then we have not been able to play a single time without almost unplayable lag. I will wait 40 seconds to open my inventory or a chest just to play for 10 to 20 more seconds before i have to wait again for the lag to stop. All players and mobs freeze where they are until the lag spike ends.  Not worth keeping the realm open when its completely unplayable with friends.