This updated brings a performance improvement to minimize stuttering issues for those with large amounts of RAM as well as several crash fixes. This is a required update for clients and servers.
The changelog can be found here:
http://steamcommunity.com/gid/103582791441057506/announcements/detail/2538191104018041668
The changelog can be found here:
http://steamcommunity.com/gid/103582791441057506/announcements/detail/2538191104018041668