Since our world ME World Vikings US has reached a size of 37mb (reported on world load) we have begun experiencing a lag in only the Local sim speed of all players on a cyclic bases. Approx every 3 to 4 minutes all players including admin will get a local simspeed drop of as much a 50 % this is short bounce and also causes a short rubber banding of the character. This is happening all the time regardless of number of players. I have tested online myself no other players online and experience this bounce even if I am standing still (no rubber banding if standing still) but still experience the rubber banding if any movement even if no crafting or building is being done. The larger the world gets the worse it gets. There is no corresponding drop in Server sim speed it is strictly a local sime speed drop. Our world is large and has a lot of players and has extensive railroads and the grading that goes with them. This effect's all players regardless of their ping or FPS including admin. Server is private equipment. 6 core i7 32gb ram I have not noted any cpu drag rarely goes above 45% and that is only on saves and restarts Also network speed even with 6 players is well under max avail bandwidth for my system as far as I can tell I have 840mbs of up speed and 25mbs of down have considered that the down speed may be the issue but it does not seem to be indicated by the network performance monitor.