UHC server crashes

keep on getting theses mesages when i play the uhc server is there a new
2014-01-10 22:58:10,863 WARN [server0]: Can't keep up! Did the system time change, or is the server overloaded? Running 5684ms behind, skipping 113 tick(s) idk what to do i need to host this UHC keep on getting theses mesages when i play the uhc server is
there a new server code that reduces lag or something to fix the tick problem