[Dujma]

If you have many timers set them with diference of 0.001 miliseconds. Like 1000, 1001, 1002. That give enough time for the server to handle the data. And loops can be a problem in timers. If you have like two loops in fast timer that will realy lag your server...

EDIT: And don't always use your timers under OnGameModeInIt. Set them only when you need them and kill them when you are finished with checking/action...