Replace sleep with uiSleep

see the below links for more info. uiSleep is based off of a more
accurate method of tracking time, whereas sleep can fluctuate depending
on application performance since it is based on framerate.
https://community.bistudio.com/wiki/uiSleep
https://community.bistudio.com/wiki/sleep_vs_uiSleep
https://community.bistudio.com/wiki/sleep

SQF/dayz_code/system/BIS_Effects/secondaries.sqf

@@ -21,7 +21,7 @@ while {_int>1} do
 	};
 
 {
-	sleep _x;
+	uiSleep _x;
 	if((_lifecheck&&(alive _v))||(isnull _v)||(((getposASL _v)select 2)<0))exitwith{};
 	createVehicle ["SmallSecondary", (_v modelToWorld _effect2pos), [], 0, "CAN_COLLIDE"];
 }forEach(_list);