UIView animation leak / memory requirement ?

Code:

	MyAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
	
	[UIView beginAnimations:@"myAnimationID" context:nil];
	[UIView setAnimationDuration:1.0];
	
	[appDelegate.window addSubview:appDelegate.viewController.view];
	
	// configure your animation using a nice flip transition
	[UIView setAnimationTransition: UIViewAnimationTransitionCurlDown forView: appDelegate.window cache: YES];
	
	// do it!
	[UIView commitAnimations];
	
	[self.view removeFromSuperview];

I am using this animation in around 10 places in my code, and one of them occurs almost on every tap on my application. I observe, over a period of time the application is used animation starts slowing down and so.

I need to know if this is the way it has to be done or i need to do kinda cleanup stuffs, somehow

CH