Delay in displaying message on screen

Hi everyone, In my game i want to display a message of congratulations when a certain number of people are saved. In my update I trigger a flag when the condition becomes true:

 if(peopleSaved == 3) {
        g1_1 = true;
 }

Then in my OnGUI function I check whether the flag is true and display a message. For example:

 if(g1_1) {
       GUI.Label(new Rect(130,20,115,30), "Congratualations!", myGUIStyle);
 }

The problem is there is a delay between when the condition becomes true and when the message is displayed. Its a small delay, but a delay nonetheless. Shouldn't the message come up instantaneously? How do I get it such that it is? Thanks in advance.