Advanced Sessions Plugin

Hello, Please I have a question for you… I ran into an issue… I run a dedicated server using steam. I have 2 mods with small maps and they work perfectly, I can join throught steam and everything… The problem comes when I want to load a gamemode with a 20x20km map,… When I try to do this on a machine (server or PC) with processor with less than 3ghz I get this error.
[2017.09.03-11.59.07:388] 2]LogOnline:Warning: Async task ‘FOnlineAsyncTaskSteamCreateServer bWasSuccessful: 0’ failed in 17.200534 seconds
So my question is: Please where can I increase the AsyncTaskTimeout? Or how can I fix this?