Updating Sims?

Hi I own alot of land in Bowfin and there has been talk from the neighbors that the sim hasn't been updated as much as the others, and that is why we have such a problem with lag and a few other issues. I don't really know what updating a sim means, but is there a way to know if a sim is going to be updated anywhere in the near future, or possibly a place I could find out some information? Thank you.