Servers lag when starting a gameserver

[JJFS]

I noticed when installing a COD2 server and when it's done and starts the service it starts to lag for a bit ingame on a gameserver.

Can that be because all services run as user "system" and having a higher priority then the user "Administrator" ? Atleast I heard about that and was adviced to always use the user Administrator for it but I'm not interested in changing all services I make in the gamepanel hehe.

[ECF]

Services start in normal priority regardless of the user account that it is run under, unless you specify it to start at a higher priority, which we do not.