[PrO.GameR]

Just replacing those two with these two will affect your performance greatly.

PHP Code:

Float:GetDistanceBetweenPlayers(playerid,secondplayerid)
{
    new Float:pX, Float:pY, Float:pZ;
    GetPlayerPos(secondplayerid, pX, pY, pZ);
    return GetPlayerDistanceFromPoint(playerid, pX, pY, pZ);
} 


PHP Code:

 GetPlayerSpeed(playerid)
{
    new Float:ST[4];
    if(IsPlayerInAnyVehicle(playerid))
    GetVehicleVelocity(GetPlayerVehicleID(playerid),ST[0],ST[1],ST[2]);
    else GetPlayerVelocity(playerid,ST[0],ST[1],ST[2]);
    return Floatround(VectorSize(ST[0],ST[1],ST[2])*179.28625);
} 


However judging by this piece of your code, I would say your whole GM is just as poorly-optimized as these.