iphone - becomeFirstResponder slows down app -

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i have 2 textfields username , password , submit button. when submit button pressed check performed see if username , password typed or not. if not shows alert message , field value not entered becomes first responder. 

-(ibaction)loginpressed:(id)sender {       if ([username.text length] == 0)     {         [self showalert:@"invalid username/ password"];        [username becomefirstresponder];         return;     }      if ([password.text length] == 0)     {         [self showalert:@"invalid username/ password"];       [password becomefirstresponder];         return;     } }

i observed on clicking button, button remains selected 1.5 seconds , alert shown. if comment out becomefirstresponder method, works without pause. need becomefirstresponder there. how speed things using this?

switch ordering of becomefirstresponder , showalert.


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